I've ran a couple HPDE with the CCA at the Roval and had no issues. Both times it was around 90 degrees on track and I ran full sessions.
The last time out there, someone in an E92 335 had the same issues as the OP and it was maybe 85 degrees on track. He couldn't get a full session in without limp mode. Go figure??
Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."