diff --git a/lighthouse-cli/test/smokehouse/pwa-config.js b/lighthouse-cli/test/smokehouse/pwa-config.js
index 752e40f31752..a08be3fd2d1f 100644
--- a/lighthouse-cli/test/smokehouse/pwa-config.js
+++ b/lighthouse-cli/test/smokehouse/pwa-config.js
@@ -38,6 +38,7 @@ module.exports = {
     ]
   },
   {
+    passName: 'domstats',
     gatherers: [
       'dobetterweb/domstats',
       'http-redirect'
diff --git a/lighthouse-core/config/config.js b/lighthouse-core/config/config.js
index 6a9d8cdc983d..f0049b29769f 100644
--- a/lighthouse-core/config/config.js
+++ b/lighthouse-core/config/config.js
@@ -129,13 +129,12 @@ function validatePasses(passes, audits, rootPath) {
     });
   });
 
-  // Passes should have unique passName's. Warn otherwise.
+  // Passes should have unique `passName`s. Warn otherwise.
   const usedNames = new Set();
-  passes.forEach((pass, index) => {
+  passes.forEach(pass => {
     const passName = pass.passName || Audit.DEFAULT_PASS;
     if (usedNames.has(passName)) {
-      log.warn('config', `passes[${index}] may overwrite trace ` +
-          ` of earlier pass without a unique passName (repeated name: ${passName}.`);
+      throw new Error(`Passes must have unique names (repeated passName: ${passName}.`);
     }
     usedNames.add(passName);
   });
diff --git a/lighthouse-core/config/plots.json b/lighthouse-core/config/plots.json
index c5739b869ad4..66bb042c0081 100644
--- a/lighthouse-core/config/plots.json
+++ b/lighthouse-core/config/plots.json
@@ -1,6 +1,5 @@
 {
   "passes": [{
-    "recordNetwork": true,
     "recordTrace": true,
     "pauseBeforeTraceEndMs": 5000,
     "useThrottling": true,
diff --git a/lighthouse-core/gather/gather-runner.js b/lighthouse-core/gather/gather-runner.js
index 3e9b9b6949af..5d2b4c948e2d 100644
--- a/lighthouse-core/gather/gather-runner.js
+++ b/lighthouse-core/gather/gather-runner.js
@@ -85,7 +85,7 @@ class GatherRunner {
     return Promise.resolve()
       // Begin tracing only if requested by config.
       .then(_ => options.config.recordTrace && driver.beginTrace(options.flags))
-      // Network is always recorded for internal use, even if not saved as artifact.
+      // Network is always recorded for gatherer use
       .then(_ => driver.beginNetworkCollect(options))
       // Navigate.
       .then(_ => driver.gotoURL(options.url, {
@@ -238,7 +238,6 @@ class GatherRunner {
         // an object with a traceEvents property. Normalize to object form.
         passData.trace = Array.isArray(traceContents) ?
             {traceEvents: traceContents} : traceContents;
-        passData.devtoolsLog = driver.devtoolsLog;
         log.verbose('statusEnd', 'Retrieving trace');
       });
     }
@@ -249,7 +248,7 @@ class GatherRunner {
       return driver.endNetworkCollect();
     }).then(networkRecords => {
       GatherRunner.assertPageLoaded(options.url, driver, networkRecords);
-      // expose devtoolsLog & networkRecords to gatherers
+      // Expose devtoolsLog & networkRecords to gatherers
       passData.devtoolsLog = driver.devtoolsLog;
       passData.networkRecords = networkRecords;
       log.verbose('statusEnd', status);
@@ -351,8 +350,7 @@ class GatherRunner {
             .then(_ => GatherRunner.pass(runOptions, gathererResults))
             .then(_ => GatherRunner.afterPass(runOptions, gathererResults))
             .then(passData => {
-              // If requested by config, merge trace and network data for this
-              // pass into tracingData.
+              // If requested by config, merge trace -> tracingData
               const passName = config.passName || Audit.DEFAULT_PASS;
               if (config.recordTrace) {
                 tracingData.traces[passName] = passData.trace;
diff --git a/lighthouse-core/test/config/config-test.js b/lighthouse-core/test/config/config-test.js
index 2d0905cd16b5..266187814baf 100644
--- a/lighthouse-core/test/config/config-test.js
+++ b/lighthouse-core/test/config/config-test.js
@@ -82,21 +82,7 @@ describe('Config', () => {
       audits: []
     };
 
-    return new Promise((resolve, reject) => {
-      const warningListener = function(args) {
-        const warningMsg = args[1];
-        const isMatch = new RegExp(`overwrite.+${unlikelyPassName}`).test(warningMsg);
-        if (isMatch) {
-          log.events.removeListener('warning', warningListener);
-          resolve();
-        } else {
-          reject(isMatch);
-        }
-      };
-      log.events.addListener('warning', warningListener);
-
-      const _ = new Config(configJson);
-    });
+    assert.throws(_ => new Config(configJson), /unique/);
   });
 
   it('warns when traced twice with no passNames specified', () => {
@@ -109,18 +95,7 @@ describe('Config', () => {
       audits: []
     };
 
-    return new Promise((resolve, reject) => {
-      const warningListener = function(args) {
-        const warningMsg = args[1];
-        if (new RegExp(`overwrite.+${Audit.DEFAULT_PASS}`).test(warningMsg)) {
-          log.events.removeListener('warning', warningListener);
-          resolve();
-        }
-      };
-      log.events.addListener('warning', warningListener);
-
-      const _ = new Config(configJson);
-    });
+    assert.throws(_ => new Config(configJson), /unique/);
   });
 
   it('throws for unknown gatherers', () => {
@@ -298,7 +273,7 @@ describe('Config', () => {
       },
       passes: [
         {recordTrace: true, gatherers: []},
-        {gatherers: ['accessibility']},
+        {passName: 'a11y', gatherers: ['accessibility']},
       ],
       audits: [
         'accessibility/color-contrast',