Never found them seriously hold sensitive unless the tank contacts the barrel...if it does, then any contact with the tank is contact with the barrel.HAve had a couple of QB barrels that were not all that accurate no matter what I did. Those problem barrels are in the minority, but there are some that won't shoot wortha hoot.Were it me, I'd do the following:1. Shoot it sandbagged with the bags just touching the wood stock. That would have the front back "choked up" close to the stock screw/trigger guard.2. Shoot slow, so that the temperaure drop from co2-gas-decompression has time to warm up back to normal.3. Try as many pellets as you have on hand. May be that it likes one of the lesspooular "odd ball" pellets that deosn't bet a lot of on-line write up.