Don't worry about your straps, so long as you can get the board to do what you want.
When I have mine tight, my feet really get stuck like they'd snap, while more open they have a greater range of motion which helps me do different things (jump, surf, head upwind, etc.) But a friend of mine has his really tight and does backloops, shove-its, and some surf (although I haven't seen him hit the lip).
Look at these unusual shots from the clew-view: