Originally Posted by peter_gunn
On your first picture its almost impossible to draw (especially hard) because CB and OB are frozen on the rail. When you draw CB will hop a little and rail will send CB to the right
This is the reason the CB leaves the rail. The ball is slightly under the rail and every shot (not just draw shots) hops a little, so it hops up into the overhanging rail and rebounds away.
Hit softly or with a little inside spin to squirt it out and curve it back. Better yet, don't leave the CB on the rail.
When the CB isn't on the rail you have to overcut it slightly to allow for contact throw, like any other shot. Shoot it like any other shot at that angle.