bort:
the loss of skin tells me that you aren't "snapping" the throw. if you "hit it" in the right way the disc should catapult off the thumb pad. sounds like it is dragging and sliding against the thumb.
a crow hop is a term used to describe the mechanics of a long baseball throw. basically it starts with the feet perpendicular to the target. start with some weight on the left foot and "hop" your right foot towards the target line beyond and in front of your left foot. that should build a good leg drive into the push back onto the left foot.
thumbers don't really glide unless you have enough power to bring it back up topside.
key factors are HSS and LSS. flippier discs are easier to kick into the corkscrew. discs with a lot of LSS will aid in pulling through the corkscrew.
the best discs have a negative HSS and a very high LSS.
discs can be stable at HSS, but it will take more power to get them to roll over.
from a flight characteristic standpoint, discs like flicks, wildcats, z xs, epic, teerex, pulse, diablo etc. tend to be best suited for these shots. keep in mind that while i rate the flick, teerex and pulse as stable at high speeds, they are in fact slightly understable but only people with tremendous power (or into a strong headwind) will ever really experience that. discs that are quite squirrely and with moderate to strong fade are also prime for this shot.
keep in mind that you want a disc that will carry a while before it kicks into the corkscrew. if it flips right away it won't get a lot of carry. also, discs that are so overstable that you have to give them tilt to flip them will often flip too early when tilted as well.