This mod lets you control how likely to find good items. Increase your luck to have powerful builds or decrease your luck to have cope builds.
https://thunderstore.io/package/Lawlzee/ItemLuck/
Every item is internally ranked using a tier list. If you increase the item luck, items higher on the tier list will be more likely to spawn. If you decrease the item luck, items lower on the tier list will be more likely to spawn.
You can configure the item luck and the item ranks in the settings (Settings > Mod options > ItemLuck)
The tier list is defined here.
Disclaimer: The default tier list not perfect. It is based on my experience as an E8 player with ~500 hours who doesn't play with lunar items. Feel free to change it in the settings.
Yes. They will have the rank Unspecified by default. You can change the rank in the settings.