Interesting observations.
I found the same - deadlifts, Cossack lunges fire it up. And so do the recommended stretches like happy baby.
I cannot look at my trainer (says the gal who used to ride Uber Pretzel on Zwift and round it out to a 100 miler cause of Ego). My $$$ saddle makes no difference, I can ride only heavily lubed up with lidocaine and then I have to pay back for it for days after the ride.
I think this is just how I am going to be from now, this is my new reality - my underparts burn. And I try to be stoic about it.