[wonderwrench]

Bill, yes too much tension will cause roughness as you say. It's pulling up on the shaft. Try loosening it and re-adjusting for slightly less tension. I was playing with my parts set, and I can get it pretty smooth without slippage. Make sure there is NO grease on the tuner turn-stile wire(lack of a better word). It's a little tedious, but just keep doing it ever so slightly.

The roughness in mine is not related to dial drive to drive wire alignment.
I could feel the roughness with the dial drive in my hand. With it installed the roughness is felt mostly in the outer high speed knob. The roughness goes away when pressing in on the low speed knob while turning the high speed knob.

Note I found the dial drive to drive wire adjustment in its loosest position and its in the full loose position now with no slippage. The spring tension adjustment I was referring to is the spring that loads the balls.