I just happened to have finished one of the Gary Semics videos I have on turning in ruts, so here's what I could see:
Before entering the corner, you should be standing up, weight back. As you enter, sit down / slide your butt forward while keeping your arms fairly straight. As you accelerate, lean your upper body forward.
You should ride the brakes in until about 1/2 way into the rut. Right before (or at the same time) getting on the gas, that's when your foot comes off the peg and you release the brakes.
On righthanders, your toe should modulate the brake while your heel isn't touching the peg. That allows you to get your butt far enough forward and still use the brake.
Weight the outside peg whenever possible, keep your elbows up.
Not that I can really do any of the above with any real expertise, but that's what Gary's video says.