I did get holding calls in M25 frequently with the slider around 60-63 if I remember correctly. I'm not sure of the exact number, but it was charter's All-Pro sliders. Could have even been in the 50s, not sure. That slider did increase holding calls, from my experience with it. But then, we also believed it had an affect on the O-linemen holding their blocks longer and getting better push.. lol. Maybe it did.
I don't know what's up the penalties this year. At 52-51 I saw multiple roughing the passer calls (player bumping into the QB), so putting that at 50 is the right move. I've seen a couple face masks and holding as well, but not too much. I think I've seen one, maybe two clipping calls. Less penalties from the common ones overall, than M25 though..