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Some things occurred to me as I read this.
1) The belt will move around a bit. This is normal.
2) Some guys will try to set the belt with the bike in the air, which is wrong.
3) Next time you go to change the tire, slacken the adjusters by a known amount, like say, two full rotations. Then when you go back to put the wheel on you just tighten the adjusters two revolutions and you’re good to go!
4) Re-torqueing the front drive sprocket is part of routine maintenance. Every 50K miles. The front pulley’s splines can wear out, make the front pulley wobble, and forcing the belt all over the place.