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I think using 11 bits fixed makes sense. You don't need to repack and pad the bits a second time when converting to words. The algorithm could do most of the transformations on the word level (11 bit chunks). Basically you can then compute the n-th word of the secret using the n-th word of the shares (plus the indices of the share). And 2047 shares should be enough for everyone.
This makes the algorithm simpler and the seeds shorter as you don't have to add padding twice. I don't think there are security issues (and if there are, they are only obfuscated by switching between 12bit/11bit packing).