The paper gaskets work just fine if the sealing surfaces are flat and clean, and the bolt torque is to spec. Be advised that there are 3 different lengths of bolts used in that cover (3/4, 7/8, and 1"), and if by chance they got mixed around and/or replaced with longer bolts (e.g. a 1" bolt in a hole where there should be a 7/8"), it's quite possible that one or more bolts are bottoming out in the holes. This of course would result in insufficient gasket compression and lead to a blown gasket.
One way to see if the bolts are too long is to put the cover on without the gasket, sector shim, and spring, and then run the bolts down finger tight. They should all bottom out on the cover. If they don't, you likely found the problem.