Adding another 2-3 quarts of oil can't hurt, and it just might help the pump clear an air lock. It's beginning to sound like you need to drop the oil pan and start doing some in-depth diagnosis, however.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!