Those bindings are terrible. If you're hitting park jumps, rails, skiing hard and fast, you need to invest in a beefier binding.
The sth12 (at least from a few years ago) has a shit ton of plastic. Invest in something like the fks 140 or even the 180. Hell, even salomon makes an sth14 and 18 I believe.
Bindings get overlooked, but they're by far the easiest piece of equipment to break other than your poles.
You can either replace your bindings with a cheap pair every half a year and pray that they don't fail when you're above something high consequence, or you can cough up the 250-350 for a good pair.