Agro1 -
I had the same problems you describe even after going with the 7 quart Canton race pan. I solved the engine stumble problem by placing a 2" long rubber hose on the (I can't remember the real name) vertical tube on the aft side of the carburetor. I solved the
oil pressure problem by installing an Accusump. If you think about it, if you're in a high G situation long enough, no arrangement of baffles will force the
oil to run uphill to the collector.