Is it possible the pickup tube has simply gotten bent? Try measuring the distance from the oil pan rail to the bottom of the pickup tube, and compare it to the depth of the oil pan in the same area. Then do whatever it takes to get just enough clearance between the pan bottom and the pickup tube to suck up the oil without creating any restriction. Sometimes the simplest solution is also the best one.
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!