yah I notice them through the whoop sections more than anything, make sure you have them setup tp pivot with you in your natural riding stance too.. One of the nice things about the precision clams is they can move and flex in 360 degrees where the flex have one way motion.
As for arm pump, my thumb is weak as **** right now, I was getting really cramped after 5-10 minutes of hard riding, I notice my for-arms don't cramp up as much though, not gone completly and my arms a still a bit tender today, but I could keep going 'for what feels like' forever if my thumb didn't need work lol