Is there a possibility you ran the backing all the way to the edges? If so, I suspect the thickness inside of the slides is too great for good freedom of movement. Were it mine, and that the case, I first would attempt to remove the 1/4 inch or so from each side, clean the glue residue and see if that would correct the situation.
2000 390 Landyacht XL
1989 29' Excella
WBCCI #6673 jerry Hodge
Have no intention of arriving at the grave safely, but rather to skid in sideways, chocolate in one hand,throttle in the other, totally worn out and screaming
"WOO HOO, WHAT A RIDE!"