Well, I figured out how to prevent this bow from the hand shock that I was getting. I sold it to someone else. Ha!
Seriously, the thing that made the most improvement was using a much heavier arrow. With a heavy arrow, it shot very well and the hand shock was acceptable. Several of the guys were here today for a bow building session and one of them really liked the bow. Now he owns the bow at a very low cost, and it's a perfect match because he likes to use a very heavy arrow.
My only regret is that I didn't finish experimenting with some of the things some of you suggested. Anyhow, thanks for the suggestions.