There are two kinds of gaskets that I have seen when changing my trans fluid. The OEM gasket which had small steel bushings around each pan hole and two silicone beads along the flange, and the replacement gasket which is just a sht of rubber about .050 thick with holes punched in for the pan bolts. The first two times I changed fluid I reused the OEM gasket and had no leaks. When I replaced my fluid the third time I used the rubber gasket that was in the kit and it leaked even though I followed the torque specs. The OEM gasket was hard that is why I used the new gasket. What I finally realized the steel bushings in the OEM gasket prevented the pan from deforming when tightening the pan bolts. After trying to retorque the pan bolts and still seeing leaks I put the original gasket back in and all was well again. I would check to see which kind of gasket you have, that may be your problem. I would not buy a new pan Just see if it is dimpled around the pan holes and straighten the dimples out assuming it is just a stamped steel pan and not a casting.