Another thing you can do is to stiffen up the forearm.
Most of those plastic stocks a have channel or a series of channels running down the center of the forearm.

Get a carbon fiber arrow and lay it in that channel or cut it to lay in these series of channels and fill the voids with Brownells Acruglass (not the gel).If the voids are big,you can mix polymer beads that air soft pistols use with the acrulglass to keep the weight down.

Also.Fix one thing at a time.You will learn more

BTW.The old dollar bill clearance is not sufficient with todays thin sporter barrels.They whip around more than that. I typically use about .020 clearance.

Last edited by saddlesore; 04/26/15.

If God wanted you to walk and carry things on your back, He would not have invented stirrups and pack saddles