RE: twisted limb ?
there's a fella up here with a pretty spendy bow with some major twisted limbs. He also has a dyer longbow with twisted limbs. The curve you cant string and keep it strung as its so bad the string pops off. The longbow shoots great even with twisted limbs, go figure.
I would agree more with what Art was saying also. Bh would be probably the first culprat as most strings have some or alot, depending on material, amount of string creep (when a string stretches and wont go back to normal length or unrecoverable. But dont look just there, how are you shooting on your part? Usually you can see it but if you cant have someone who knows whats going (knows how you shoot) on watch you to see if there are any major changes.....