Crazy good update, I have almost no more booms and buffets. For me, further reducing unsprung weight was the fix.
It's weird driving, I was used to the 1-2 punch of feeling the actual shudder in the seat before I felt the issue with my ears. Now no more.
I already followed Austin's advice on getting the most sidewall on a smaller rim with a demanding road force balance, and I was very happy how much it helped.
Thought about unsprung weight , so I went further and swapped for a forged wheel. In the end, I saved about 20lbs per corner or almost 25%. The rim swap actually saved more, but then I added an off road tire, which at 55lbs is significantly heavier than a street tire.