i have look p18's on my jj's and cant complain about them.
i have them set at 10 and the release when you need them to and i havent had any issues.
to answer your other question i ski with px12's on my ar7's at 8, mainly because i ski more aggressively when i have my jj's on mostly since they have a razor sharp edge, and i ski them more on groomers as an everyday ski.
i really like the pivots, super solid binder that i feel better with the pivot system since i have tweaked my knee a few times, but that is probably more mental then anything. a lot of people complain about putting them on in powder, which it is more difficult then a regular binding, i really dont plan to have my skis off in powder.