Replying to Points of contact

The ski boot engages into the binding about an inch from your heel/toe, and then, there is an inch or so between the binding and mounting screws, in some instances. In the toe, there is two pieces of plastic (binding) interacting with the boot, and there's some play in mine.... The heel seems to have positive engagement all the way around.
I'm on dalbello/pivots, and all setups are generally this...

When we do airs, rails, hard butters and ollie's, do these boot/binding systems perform well?
How much would the ski change / perform with a more direct mounted system?