What is yall thinking on a 6 inch wedge for a 3pcs longbow

Thats not much, how long is the handle?

15 inches

Sounds short to me. I guess it would depend on how much reflex your limbs have. That short wedge wont give much limb preload without a lot of reflex. I would use 8 in. at least or power lam 2 in. past the fade.