Garage door cable de-railing

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Anyone have some insight on the following problem: My single car garage door cables keep jumping off the drum wheel. The wheels do bind slightly when crossing the bend in the track, but when the door is not attached to the electric opener is goes pretty smooth.

I thought it was the torsion spring not having enough tension, because as the door is lifted from 1/2 way up to about 3/4 of the way up, there would be some slack in the cables. The slack would remain, but the opener keeps on pulling, so the cables come off the drum and then there's a mess of tangled cables around the torsion spring rod.

So, I took the death defying act of tightening the torsion spring, which was a breeze, and now the door is weightless in the bottom position. When attached to the door opener, however, as the door gets from 1/2 to 3/4 open position, the same thing happens, with slack in the cables allowing the cables to derail.

The track itself is aligned very well, I've checked it for plumb and square relative to the opposite side. I am considering replacing all the rollers, but the thing that doesn't make sense to me is that even if the rollers are bad, there should be constant tension on the cables from the tight torsion spring, which should prevent them from jumping off.

Any help?