Replying to Binding help?

Hey everyone. Looking for some techie binding help.

I have a pair of Salomon S910s (a few years old) that are working great except for one thing. The shop adjusted them but couldn't get them to sit without a bit of play in my boot (back and forth). It's not my boots but something with the bindings. When I took them home, I did the standard adjusting (shop wasn't that helpful sigh) with the wings, top toe pressure, DIN, etc.

They seem to work fine (no problems) except when they take a big impact. After a big impact from a mogul, kicker, etc. the slipping occurs again. The DIN is already cranked to 10, and the adjustments seem ok. Is there something that I'm missing? Thoughts? Really don't want to replace the bindings.