Well to add some data to the discussion.
-belt temp. before ride 76F after 30 min ride 117F
-belt downward deflection before ride 1/2" after the ride 1/4"
I hope this helps
Your belt deflection measurements sound about right.When I checked mine,I was moving it up AND down while applying pressure.I didn't move it in just one direction.
As for the belt's temp,I never thought about checking that.I'll have to do that the next time around.Thanks for the tip. Dave!!!