Have you checked your wheel width against your tire size? A lot of people overlook that. I've seen setups where 15 PSI works great on a 8.5 inch wide wheel but on a 7 inch wheel the same tire will bulge too much and give you a totally different feel. The sidewall construction matters too. A stiff 10 ply tire might need a little less air to flex, while a softer load range C tire will get squirrelly faster. So your buddy might be right for his setup, but your actual sweet spot depends on more than just the trail.

I mean, that's pretty wild about the sheathing, but here's what I keep wondering about those 18v guns. Do you find the balance is off compared to a pneumatic? Like, I've held a few cordless framers and they always felt top heavy to me, especially when you're reaching up to nail a top plate or working in a tight corner. The battery sticking out the back seems like it'd throw off your whole rhythm after a few hours. Maybe it's just me but I get particular about tool weight distribution.

Read somewhere that mechanics in Japan use torque screwdrivers set to like 3 ft-lbs for interior trim and they almost never break anything. Maybe there's a reason for that.

Wow, 120 days? That's impressive. I don't think I could go 120 minutes near a busy intersection without grabbing something.

Cleaned mine with a toothbrush too, felt like a hair mechanic.