(((((sorry, I misread the subject line...)))))
We're almost at the same spot.
My longbow likes lighter shafts too. My recurve likes 31" 5575s with 175 gr points. But those were causing wear on my longbow strike plate. I tried 3555s bare and nibbled them down to 29-1/2 which is almost right on my knuckle, they fly great. But I need a bit more room out front I think. With 145 grains I got good bare shafts at 30-1/4.
This morning I was shooting a 30" 5575 with a 250 gr. point in my stick and it was sweet. Quiet and steady, but lots of loop at 40 yards. It had feathers though. I'll bare shaft that this weekend. The advantage with the heavier head is all the combinations of glue-ons and adapters you have to play with. My neighbor has a chrony so I will check that out as well.