I rode my + for about 1500 miles with the Vega at 20 psi and it worked well. I had always wanted to try a treaded tire, but was afraid of the install as, back in the day, there were no really good vids on how to DIY. When I finally swapped it, I still had decent rubber left, according to the wear markers, so I'm sure it could have gone over 2k.
I installed a FF Hoosier treaded and REALLY liked the confidence it gave me not only on wet grass, leaves, mud, but even on pavement. Carving on pavement just sticks better with the treads. I ran that for the first 100 miles or so at 20 psi and thought the FF Hoosier was just rounder, thus explaining the added difficulty of balancing when stopped.
Right around that time, I bought my XR . . . really needed the range. At around 300 miles, I needed a treaded tire and went with the Burris. Inflated to 20 psi (like I had always ridden) and, of course, was a bit squirrelly when stopped.
I was training someone on my XR while I rode the + and realized they were having some trouble balancing. Also saw a vid with @jeffmccosker riding and saying "16 psi, always", so I tried it. That just happens to be about 10% of my weight. That was the trick, I can now pretty much balance when stopped (or easily heel lift to stop), rides smooth as silk, and I can still get 18+ miles of range when it's warm out.
I can see if I rode more challenging dirt trails, I'd maybe add a few psi, but with my type of riding, 16 psi is perfect!