I think you have something real solid on your hands here, but after five rounds I have to admit I straight-up don't get what the game wants me to do during the later rounds of disorder.
The entire letter bank can change (sometimes multiple times) in the middle of typing out one word, and I can't figure out if I'm supposed to adjust my word mid-entry to account for the new letter bank or finish the word I started typing. Both approaches have gotten me inconsistent results, and it's a bit frustrating to try testing it when the scrambling starts so late into the run.