SBM Edelbrock/Speedmaster Head Data

Earlie A said
This port is pretty quiet all the way through. About 0.400 lift you can hear the faint 'train coming' rumble of separation starting. It never does get loud but there is some bouncing of the manometer at 0.600-0.650.

At this point I think I need to look at the shape of my short turn, especially in the corners. The center of the short turn is not that tricky. The corners are a different story. Lots of options there.

Are you taking air speed readings at all? Curious what the air speed at the pinch is, middle of port but at the pinch, before the dip, middle of dip, and after dip? If you can, also check air speed at the roof over the short turn in those lift ranges too.