I think what DC is saying that the yew bow he has now he is happy with and it is very quiet. Some of the other bows he has made gave him a whacking noise. If your tiller is good on those bows I would look at arrow spine and checking your nock height when you tune the bow and arrow set up you have. I think too stiff of arrows is more common than too weak when the arrow is hitting the side of the bow.
You're right Steve. I noticed that people weren't quite understanding my question but that seems to happen a lot. I don't write clearly I guess. I apologise for that. Anyway, I was still getting the answers that I was after so I just let it slide.
Yes, the new Yew bow is quiet. It's about 45# and the arrows are bamboo, spined from 44-50# with 100gr tips.