John, the other item you may want to measure and possibly address when you re-install your tapered wheel sets, is the amount of side play between the wheel truck frames. I am not implying you have excessive play, but I recently had this issue with my Lionel Tenders CB&Q 0-8-0 Yard Goat. There was so much play that the tender visibly skewed when I pushed cars in reverse. Ended up adding some #4 black oxide flat washers on the axle shafts when I re-assembled the truck frames. In my case I was trying to solve a different problem, but excessive end shaft play in these blind wheel sets would allow them to walk toward the hot rail that you're trying to eliminate contact with. At first I thought the distance between my wheel flanges was the problem, but after measuring them and some other equipment, turned out that wasn't the issue the entire axle was able to move back and forth over 0.090".
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