A bounce when coming down from a wheelie isn't ALWAYS the shocks fault. Sometimes guys think that if they are bottoming out on compression they think "I need a stiffer front spring" and then the bounce is a problem. Also ive seen setups that limit travel on extension, doing that compounds my above scenario. Torsion bars can be an issue because to get good suspension drop out, or droop/extension, they need to be usually in the .850" or under diameter to have good stored energy. In that case a shock with "correct" compression valving can really shine. IMO the bounce needs a shock with a pretty stiff compression stack and a nice adjustable rebound ability. Then you can tailor the rebound to not only keep the wheelie in check but also keep the nose down after landing.