I don't know about that.......seems to me like if that were the problem, you would have noticed.
Hey, hay, WAIT a minute........just take off both rear wheels and see what it does. I think they'll still touch the floor. If not, putting light pressure on them while running should be the same.
If you do glue, try not to use something so permanent. You never know when you may need to remove those wheels.
Again, good luck.