Replying to Sketchy Look Pivots

This year i decided to buy a pair of pivot 14s. I got them because i heard how great they are and how they release at the most needed times. But the thing is, they made me feel less confident. when i first clicked into them, i noticed a big gap between the back on my boot and my heel piece (before i clicked in) On all my other bindings that I have had my boot is very snug with the binding. Is the pivot supposed to do this? I also found that i can feel the heal piece move around while high speed carving and drifting. It's a very weird feeling. One time i was skiing on them and went to do a 180 and one ski released randomly as i skied out switch. I keep my dins at 8 in the front and 9 in the back. i weigh about 160lbs 5'8 and i was riding on my moment deathwish 174. Did the shop i go to miss mount them? Or is it supposed to be like this? My buddies are a bit bigger than I am and they ride on the 18's and they don't have a problem with them at all. If thats how the pivots are supposed to feel, I'm thinking of selling them..............



+K to anyone with good advice and/or help