The last takedown longbow I made I tillered even to shoot 3 under.  It tunes for 3 under at a nock of 9/16" perfectly.  Here is the strange thing.  It will not tune for split finger.  No matter what nock height I use, 1/4" to 5/8", it clangs and bangs and say no split finger.  Has anyone else run into this when you tiller for 3 under?

My last bow shot terrible split finger with an even tiller. Only when I gave it some positive tiller did it settle in. So I think you are in the same boat!

My 54" R/D's don't like split finger with even tiller either. Too much pinch from the short length on mine I'm guessing.

Try taking the nock to 0 and see what it does?

Al, how far above center do you cut your shelf?

1 1/4"

I don't build take-downs as such but I do the same 1 1/4" above for my shelf.

Something else going on there. 1/8" difference in tiller is insignificant and is corrected as you slide your fingers/nock up and down on the string.

Watch your limbs (laminated bow..I know nothing of carved bows) as you draw or hang for weight measuring. Slide the string on the hook up or down a little and you can change the appearance of the limb timing significantly with just a little movement.

Just a guess, but I suspect your arrows aren't quite rite to start. For some reason they may be missing the shelf or riser from three under and not so from split...just a guess though.
bigjim

ummm