Edwards Slide and Tarnish

[JTeagarden]

I have an Edwards 350 with a TN 22 slide, and it bogs down incredibly fast...

It seems there is no end to the tarnish I can extract from the inside of the outer slide tubes, endless rounds of swabbing with a cleaning rod and Wright's brass polish, cloth black as night each time.

The slide was aligned by the Slide Doctor 4 years ago, and not used much since then, and nothing seems out of alignment: I have never pulled out so much tarnish from a slide as this, are Edwards slides kind of known for this, and/or are they particularly tight (not a lot of clearance between the stockings and the outer slide tubes?)