I have removed and replaced mine 4 times since May and they still leak at the rear. Now I have a separate issue from you in that I didn't countersink my rear main cap so that the rear main bolts could clear my Armando pan, so after modifying the pan its still seeping at the two rear pan bolts. But having progressed through Fel-Pro, black RTV, studs etc, I can say that at present, the combo I like is the $10 Fel-Pro black composite gaskets, the Motorcraft gray Chas mentioned (applied sparingly) that's a sweet $23 per shorty caulk tube, the Mr Gasket serrated bolts and not much torgue, maybe 10-15 ft lbs. This is on my list of things to tackle this winter.
Here is a helpful thread:
Engine Builders-favorite oil pan sealing tips?