A DIN of 5 seems really low for 5'9 140lbs.. I'm 5'8 160lbs, and I'm at a DIN of 8 per the shop. (which works fine for look/rossi bindings) For Salomon bindings I had the same problem, pre-releasing while buttering, I had to increase them to 9-10, sometimes I crank the heel up to 11.  I still...