Turn & Bank, I was going to suggest you go to an extra power mainspring, to add a little more resistance to the slide recoiling, but I forgot that Wolff doesn't make one for the 4013's (Group "B"-Short), only the Group "A"-Long.
I recently bought a nice 4586 that I'm going to be shooting 45 Super from & in addition to the extra power recoil spring I'm going to use an extra power mainspring. I've done this on my 1911 too.
As far as casings going into sub-orbit, I haven't hit on a combo that keeps full power loads close. You just have to plan on hunting them down afterwards.
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