Welcome back, No4.
The flight I described was back when I had the stock turbo and was using a manual wastegate. (no - this wasnt the flight when the turbo blew).
I discussed the issues in detail with a member here, RV6guy, who installs turbos on airplanes and seems to know his turbo talk. On his advise I installed a large automatic external wastegate along with the T04 turbo and disonnected the manual boost control. The wastegate reduces the speed of the turbo compressor, so I dont have to deal with it manually.