Thanks for your suggestions. I hear you on the trust thing, machines fail sometimes. I've only had 1 painful fall... on my OW+ a couple years ago. My fault, not the board, but any caution I learned has long since worn off...
For some reason, I trust my OW+XR and just ride like it's unfailable. Maybe it's the increase in torque over the older boards. Since it seems unlikely that I'll be more careful, I picked up a pair of fangs front wheels to help in the case I push the board too far :-) Looking forward to trying them out. Got a pair for my loaner board (OW+) too, so my friends are less likely to hurt themselves (which did happen once).
I definitely recommend a FF Hoosier Whisper 6" tire if you can afford it. I installed it myself. Breaking the bead by hand took some serious effort (going to a tire shop would've been a better idea), but everything else was easy enough. Just follow the instructions on YouTube. I opted not to replace the bearings... more work than I wanted to undertake.
The new tires is soft enough that I just used a bike pump to seat the bead.