Maytag Dryer, model LDE8506ACE

Replaced the two (rear) drum rollers, two (front) drum slides, and the belt. I did reverse the drum, which the manual says shouldn't make a difference. I didn't like the way the belt positioned/tensioned - the return side of the belt was awfully close to the belt passing over the drive pulley, but I went ahead and returned the dryer to service. Sure enough, after a few weeks, the drum stopped turning and the belt is shredded and broken.

I had kept the old belt, which was operating fine before the above work was done. I have installed the old belt and the belt position/tension is even worse than what I describe above - the return side of the belt is up against the drive pulley/belt and also is running against the cutout in the metal guard around the tensiner pulley - it will start to shred immediately if I start running this way. Have double and triple checked the belt routing per the manual and it is correct.

What is wrong? Could the rollers (non-OEM) have been undersize and allowed the drum to take a lower position, thus screwing up the belt tensioning? (I have looked at new rollers on-line, with the images laid over a grid with 1" spacing, and the diameter of my pulleys look almost identical to new dimensions.) Now that the non-OEM rollers have been running, could they have worn some and dropped the drum even more?

I can't run the dryer with this issue, it has to be solved before I can run it and know that it won't immediately break down. Please help! Thanks, Rick