oil pan removal on 67 GTS

So what is everyone using for a pan gasket. The original one leaked a little when it only had 16439 miles on it. I changed it in my youth with a cork and it leaked a little too on the back edge again. The egine rebuilders leaked on the back edge and my recent attempted did too. I think I figured out why the back edge leaked after examining the pan design again so I made spreader bars for the back of the pan.

Yes this last time I made sure I straightend the pan. I used a gasket that was suppose to be crush proof, permatexed it to the pan, let it set up, put rtv for oil gaskets on the block side of the gasket and hand tightened the bolts with a nut drive to not over tighten. Thought there is no way that would leak. It did. Then I insatalled spreader bars and I had put larger washers on the other bolts to spead the forces out more. Then I decided to tighten then up more than hand tight with a nut driver and looked up the torque spec which said 15 ft lbs. I decided to try 10. The crush proof gasket squeeze out at a few bolts. Looks like it will be coming off again. I'm considering no gasket and nonhardening permatex. Thoughts?