Oh boy, was I wrong with the first impression of the new string setup!
I took it today to another club and played a set. I just couldn't miss. I rediscovered the mega spin on very short angled BH cross-court, which I somehow lost towards the end of summer. Serves were still slower then with my lighter racquets, but precise and I could put a lot of side spin to it. Love it.
It's never too late for a happy childhood!