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Sorry. I misinterpreted your focus. Consistent extraction is always desirable, as is not having spent cases hitting you in the face. <grin>
Sounds as though all you need to do is install weaker recoil springs in your guns to (within reason) get the sort of ejection performance you want. Or you can take steps to weaken the recoil springs a little, by stressing them (i.e., locking them back for extended periods, as you did with your H&K), or cutting a coil -- either way you'll likely get the same change in performance.
Too-strong recoil springs often cause problems, while a weak recoil spring that still allows the gun to properly cycle won't lead to damage to the gun... even though that seems to be a concern for many shooters. (Far more problems are CREATED by shooters installing stronger recoil springs to "protect" the frame than are prevented by that action.)
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