Shaky bindings

yep i have the same problem.

your binding isnt scooted up far enough. try scooting it up just one more notch

are the heels and toes of your boots really worn down from walking on concrete?
have you had your forward pressure adjusted correctly?

this is gonna suck to type ceause i have a seperated shoulder

but,
its either your boots worn down like this guy said, mainly your toe, check if its rounded off underneat the foot

or its the binding itself. what din does your binding go up to? 12 i think yo usaid? if you have it set at something like 10 or 11, thats too much. it will over time over stretch the spring and make it rigid and ineffective. sure it holds it in tight, but it has no give in any way and is very shaky and will develop play in it like you said.the solution is to get a new binding and, if you can, keep it at something low, like 6 or 7, when you're not skiing
or just get a higher din binding, like a 18 and keep it at 11 or 12 still. youll never pop out of it unless you're really big.

other than that, hte only other option is if the slider plate on the back of your binding is lifting off of the screwed in metal part
check if it lifts up at all
or if you grab the heel piece, if it gos side to side at all
if it does, you know thats the problem, but there isnt much you can do

remember though, redrilling a ski and fitting any binding, ESPECIALLY a new binding, (and plugging the old holes) is very compromising to the ski and can lead to a break very easily usally

good luck, and sorry for the spelling, once again, seperated shoulder.

scoot the heel foward

a big one that has happened to a lot of people i know is having their din settings too high as Dr. NS said.

i scooted the back up a notch already but i'll try doing it one more. i think the main problem is that they are cheap bindings.

nx series = nova series = axium series
theyre a cheap binding that isnt really recommended for freestyle, instead they are more a binding recommended in a package deal from a shop because they are cheap to add on and make it seem like youre getting a good deal.

Check your forward pressure. Duh.

this may sound dumb but what exactly is the forward pressure?

The clue is in the name...