I do not believe replacing the rubber will make any difference.
Some members have had fixed this problem by removing the door panel and widening the front track (and pushing it forward a bit) to ease the friction / drag.
The only problem with this fix is you cannot widen the track (or push it forward) at the top 1/3 of the track due to the mirror, where it is welded in place. It might work but will most likely will raise slower near the top.
Slotting the holes, that hold the lift arm in place, is not major surgery.
Slotted holes are used all the time for adding adjustability. (Like on Alternator Brackets, for tightening the belt).
Using a washer and lock washer should remove any fear of having slotted holes.
Take the time to watch the window raise and lower a few times while the panel is off.
If you see the arm pull away from the bottom of the glass, add some washers to keep it under the glass, otherwise the tabs will break.