So far we have not seen any of the GM fixes last. The flushes seem to only be a bandaid, and the GM replacement TC is still showing issues like others above have shared.
We do know of one company making a billet race spec unit that has cured the issue and as they are a higher stall greatly improve acceleration. And they offer them for the V8 and V6 A8.
Email or Engineering team direct for more info:
Tech@EliteEnginerringUSA.com
Cheers!