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I agree with Nick, the position of the roller on the belt cannot effect the tracking of it.
But if it is out of square with the belt then it will make it run off. I witness this when I use support rollers on long lengths of wood when I run it over machines. If the (smooth) roller is not dead square to the wood, it will run it off course, quite uncontrollably.
To test this you could bolt or screw the tensioner(s) to a flat piece of wood or metal and check the rollers with an engineers square.
If the rollers are running the belts off why do they not continue to ride off the pullies? Or have you not run the engine (long enough) with these tensioners?
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