I appreciate the feedback.
To address some of the questions/comments:
TECHNIQUE: While I'm sure I could always improve, I think my lean technique is better than average. My approach when entering corners/curves is to 'lead with my chin'; look into/beyond the turn, lean into it with my upper body, etc.
NEW VS. USED: I bought the bike used, from the original owner, with around 19k miles. The PO is an engineer, and meticulously cared for his bikes (this was actually the wife's ride).
SUSPENSION: Not lowered. I've never adjusted the suspension since purchasing because A) it's felt pretty good to me all along, and B) no matter how many times I read/hear about suspension adjustment, it still seems like something of a black art to me.
TIRES: Front is still the Bridgestone TrailWing that came with the bike; it's down to the wear bar and will be replaced once I put the bike up for winter. Rear is a Shinko 705 I put on before I did a 4-day ride back in August. Maybe 2k miles on it.
PEGS: Stock, as far as I know (the PO had very detailed maintenance records, including aftermarket parts, and there was nothing there indicating replacement pegs). I don't know peg feeler length; I assume they're stock as well -- honestly, I haven't looked at them closely enough to notice if they're removable.
Another thing I noticed when it happened a couple of days ago -- it seems to occur when I'm taking a relatively sharp (90 degrees, for example) and I'm accelerating mid-turn. Perhaps the act of accelerating is causing the bike to 'squat' a bit, which could reduce clearance.