no. dont dremel anything, personally i wouldnt use double gaskets. the float on the crank is important and a double gasket will might throw off your shimming in the transmission.
are your races sticking up too far from the crank cheeks? then they need to be pressed in further. they should be nearly flush with the cheeks...
take out the bearing cups (heat case halves) and try to press them again. if i remember they should be flush in the case. nothing should stick out.
maybe measure your old ones with a micrometer and compare to new just to make sure its not a flaw with the new bearing sets?