Well, so I can actually contribute instead of yuk it up, here's something else I have to say.
Are you really sure that fuel isn't leaking from your tank? Since I used rubber padding under my tank and since I had over-tightened the mounts, hairline cracks developed around the base of two of the studs. For a while I didn't even notice it was leaking, since overnight it would slowly drip. I was losing so much fuel! After epoxy fixes and poor solder work on my part, I just got a brand new tank from Pirate Cycles. I discovered that the best way to mount the tank is to use double-sided gorilla tape. That way vibration isn't transferred to the studs and I wouldn't have to over-tighten just to get the tank to stay in place.