You have to be careful going with a double band setup. You don't want to over-power the gun, it can cause wear to the trigger. Also too much power makes the gun hard to handle. You could make your own band and lace it through the muzzle on your gun.
If there are better shops for spearfishing, I would go and find the one your most comfortable with and see what they can do to help you. You did not buy the gun from them, so they may not be too eager to help until you start buying stuff from them.
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