Red Hawk;
Try to keep your feet in a straight line under your shoulders to hips to feet.
Feet to close together will cause an archer to sometimes lean back into to release arm.
Shooting with a slightly bent elbow is my prefered method of shooting .
I find shooting a straight arm will cause bow tork at the grip.
As far as leveling goes I prefer to shoot a Classic Scope Magnum with a 4X plano convex lense scope and Sure Loc sight with a bubble level and I use a Toxonics Hybrid IV fixed pins sight with a bubble level also, this will let me know if the shot will be true to form or if I am torking the shot.

When you feel the skip it is usually due to( for me ) the release elbow dropping or holding the release elbow to low. I learned this from experience, I would come to full draw and the bow would want to jump forward out of full draw, had an archery coach point out to me that this was happening because I was holding the release elbow to low , raiseing the elbow solved the problem for me. Try it , it maybe the answer you have been looking for.
Hope this helps you.