If the bolt goes fast, it won't has time to tilt enough.
Ok, I can see that. I would point out that there is a fine line between getting the bolt carrier assy to move backwards faster AFTER it unlocks, and still keeping the unlocking at the proper point.
Unlocking too soon, because the carrier is being pushed back harder, in order to move it faster, in order to (hopefully) reduce or eliminate "dinging" the extracting case, would not be a good idea, I think.
Slight stoning or filing to break the sharp edge might do it, but then again, it might not. You'd have to try it and see, I think.