Help, Another Oil Pan Leak Thread

OK FABO, I need some help. I have a stock block 340 with an 8 qt Milodon oil pan. This is a new motor with only 200 miles and I have had the pan off 4 times trying to fix the rear pan seal from leaking. I have installed the pan with and without gaskets (RTV only once) to see if I could get a little more clamping force on the gasket. It leaks between the main cap and rubber seal. The last time I staged all the gaskets on the pan with RTV including the rear seal and bolted it to an extra short block I have to seat them. Looked excellent when I removed it. I installed it on my motor, no RTV on rear seal at main cap and it started seeping after 5 minutes of running. Do I scrap all the gaskets and just use RTV. The front timing cover gasket has never leaked. Any ideas appreciated. :BangHead: