I had a leak at the primary inner cover to crankcase with a new AN gasket. Made my own gasket from 1/16 inch thick synthetic cork ..... leak stopped but the 1/16" material required me to Dremel out a small relief to fit the stator mount. This would not be a factor with the P11's stator mount, but using 1/32" cork would/should solve leak without an interference problem.
The three mounting screws must be thread sealed, as the holes are thru to the crankcase.
The sliding disc seal on the transmission shaft can be better sealed by separating the inner and outer discs, and bonding a cork washer to the inner primary cover. Then rejoin the discs using short 4-40 or 6-32 pan head screws and red loctite on the nuts, tightening enough to get a snug sliding fit.
Keeping my fingers crossed, but at the present time, my Atlas primary is 100% leak free!
Slick