Sorry, not sure i follow. You’re skimming and discarding what you skim (braun hefe etc) or are you pitching what you skim? I thought that skimming the top at high krausen was the same as top cropping and thus would be some of the better yeast (or at least the most “top” fermenting). I’ve been top cropping WLP002 with good results when I want to brew a few days apart and don’t have any yeast in a starter.
I’ve been skimming the brown gunk on top of the Krausen. The hop material and dead yeast. Not top cropping and grabbing live yeast…
Dave