Sounds like the toe part isn't tight enough. If you could post a few pictures of what it looks like when you're strapped in then I should be able to see what needs adjusting. If you just want to try some thing then you could try moving the inside main strap adjustment a 1 or 2 notches UP or moving the front strap adjustment a notch back.
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2011 Smokin Buck Ferton 155
2013 Flow NX2-SE
2013 Flow Hylite boa
Burton Stagger pants/jacket