Din Help

Sounds like you need the forward pressure adjusted if it comes off that easily at 9.

That

Your skis should definitely not be coming off that easily at a 9 for your weight unless you have really short bsl (boot sole length). The toe and heal piece might be a little too far apart or something. Go to a ski tech and have them look at it. If you just go to a guy at a rental shop at a ski area they probably won't charge much if anything to at least look at it. You might even want to lower the DIN after getting it figured out.

Do you find that your toe pre realease when you butter or land backseat. If this is the case you have hot the limit of a z series binding. Personally I can't keep the toe in a z series even at 12. It's just the design they are not really meant for aggressive skiing. For that get your self an sth 12 driver or an sth 2 13.

If they are popping out seemingly randomly and it's not the same movement every time you prob just need the bindings setting up.

That's probably your issue.  Z series bindings aren't the best for anything aggressive.