In my opinion, it's much better to shoot with both eyes open. It allows for depth perception. For many years, I closed one eye (compound/peep habit). It took some work, but I now shoot with both eyes open, and it does help.

Canting your bow gets it out of your sight picture. If you are used to this, no reason to change if you start to gap. Just remember to cant your head at approximately the same angle.

Chad