I tried using black Gorilla tape to help center the liner in the middle. The Gorilla tape didn't stick to the inside of the tire and my liner still took me a while to center properly in the middle. I had to air the tire up just enough to push against the liner to keep in place. I would run my hands on either side of the tire without being seated to push/pull the liner in the middle. I spend almost the same amount of time getting the liner straight compared to dismounting, fixing, and remounting the tire. The inside of my Vee8 tires are very slick and I'm not 100% sure if my liner is centered right now or off to one side or the other around the tube (orginal reason for the Gorilla tape)?
I didn't try Gorilla tape directly on the overlap sections of the liner. I just cut down the length for minimal overlap after the pinch flat. The pinch flat happened on the side of the tube where the overlapped section of the liner moved off to the side and bunched up causing the pinch flat with the tire flexing in normal paved road riding.
For my type of riding; it is the combo of Vee8 tires, Mr. Tuffy, Stans tire sealant, and spare tube that gets me back on the road the fastest for my riding conditions in the southwest. I got my first flat in a few days with just Kenda+tube. I usually go 3-4 months between "tire falling off rim" flats at 50-75 miles per week. Most I do now is pull out the goatheads, let Stans do its work, check PSI, and add more sealant every couple of months. The key is being able to find the right combo to ride home instead of having to call for help or push the bike home.