I am a little embarrassed about this but I must be honest, this mod isn't necessary.
I didn't realize but even tho I knew the bag on my CT mini wasn't full, I had been doing some drywall sanding and my vacuum was down due to the drywall dust cloging the pores in the bag.
I pealed off the rubber strip and ended up having to turn the vac all the way down to prevent hopping; dust collection is great with the flat pad on this sander as with all other Festool sanders I have tried.
Oops...rookie mistake, live and learn.
The moral to this story is; never doubt a Festool
, check the human factor first.