5,000 rounds before cleaning? Am I an old fart or what? I know you are shooting a Glock, (and they don't jam) but dang I still clean my guns before a match (because I practice before I compete) and after a match. And, no I don't own stock in gun cleaning companies.
I also have been using Bear Creek Moly Bullets for a very long time in all my guns, both revolvers and autos. I think lead bullets are the way to go and dry moly lube is superior to wet lube. If any of you ever shoot in a indoor range the wet lube bullets will smoke up the joint, and yes your powder does make a difference.
For all you who use FMJ bullets, your barrels do get fouled. Copper fouling is not as noticeable as lead or moly fouling, but it is still there. And it does have a big affect on accuracy.