front axle seal still leaks after new seal

[Jason03]

ok guys any idea what i'm doing wrong, i have an 03 silverado with a leaking drivers side front axle seal.  i bought a new ac-delco seal, popped out the old one new one in and it leaks worse.  thinking its not really something you can install wrong i reluctantly assumed i got a bad seal and bought another one.  i was super thorough when replacing it, cleaned the surface, careful not to damage the seal etc.  i even put a little rtv around the outside of the seal.  i made sure the breather is clear, the diff isnt over filled and wouldnt ya know it it leaks worse now than ever.  idk what i could be missing.  theres no orientation of the seal i even consider i had installed it backwards, nope its pretty clear how it goes.  the axle shaft is shiny and clear, no pipping or groove and its definitely leaking from the seal.  id welcome some ideas

[CamGTP]

Try a different brand seal is my only other thought. I've used seals from Napa all the time with no issues.