I've always hated burton's binding systems. Now they managed to create a system with infinite adjustability. To me, infinite adjustability = infinite opportunities to get a headache from frustration. My advice- buy a different brand of bindings and board.
OP, you're on the right track with it just being the indicator holding you back. If you wanted to you could push your bindings another inch towards to the toe side.
Although I think the main issue here is how you're measuring overhang. You want to strap the boots in, then lift the toe edge while pressing the heel edge into the floor/counter. When the heel or heelcup touches measure the angle (a lot of smartphones have anglemeter apps these days, or just use cardboard). Do the same with the toe edge until it touches.
It looks to me like your bindings are fine in fact they may need to go back towards the heelside a bit!