please consider that i'm playing 6max not FR, but in my recent expeditions at 25NL, having beaten the lower levels the same as you, I can share that KK is good for preflop all ins. I've been witnessing AQ+/99+ ...my villains are typically more loose aggressive in general though i gather, not a whole lot of nits.

I always take the line that if I run into aces thats life, and that sooner or later I'm going to have aces that run into kings.

would perhaps see things differently if you had 3 bet and were facing a nits 4bet shove.