Try in a pool first with 2, 3 and 4 bands. You will probably see ur shaft hitting much lower between using 3 or 4 bands, that's when u need the muzzle stabilizer...if u see that marked difference in the shot placement.
You will need a fix target for reference.
As long as 3 or more bands does not shoot erratic, u are ok. If the shots goes left, right, up or down, probably you need to upgrade to 3/8 shaft to cancel the shaft whip effect but with enclosed track, I guess no shaft whip for you. If it is still erratic shooting probably you have too much shaft over hang at the muzzle or spearhead/slip tip weight too much.
Well this are just the possibilities. Me no experience with EC track guns yet.......
