Holy Batman, it worked!!!
I finished 4 x 25min sessions today at 60F ambient with ZERO limp modes and oil temps did not move past 250F!!! That's with the stage2 STETT oil cooler and 2 bottles of Mocool in the radiator. Didn't even bother turning the heat on. Heck, in session 3 I ran several laps in 3rd gear trying to get the car to overheat, didn't happen. In comparison, a few weeks ago I got a limp mode at 46F ambient within 4 laps, boost levels same for both events.
On the way to the track oil temps stayed at 1 tick (190F) past the thermostat level for the entire 2.5-hour drive . On the way back I think I saw 220F while stuck in traffic.
The real test of course will be later this summer at 80-90F ambient but this is a very promising start! I had a blast today, no limp modes and the chance to drive a track where you can go airborne on every lap