There is no heel cup depth adjustment on these (that I can see), so it wasn't possible to put my boots back any further.
I think we have a winner. There absolutely is a heel cup adjustment on the NX2 bindings. There a two holes on the base to mount the highback/heel cup pivot. And they ship in the forward position. It seems you had the right size the first time.
Flow NX2 Series "How To" on Vimeo
About 1:07 in it shows the heel cup adjustment.
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2011 Smokin Buck Ferton 155
2013 Flow NX2-SE
2013 Flow Hylite boa
Burton Stagger pants/jacket