Q3 are crap for mileage. Get a set of pilot roads. You can still find PR2s for cheap. I've done 5+ track days and commuted over 12k miles on one set alone. 919 is on its 3rd set. Tuono is on its first set of PR4s and they're amazing, wet conditions, nearly 4k miles, 1 track day and they still look new, that's with a vtwin with massive engine braking.
As to tires, tire size matters. Also it sounds like your tire has squared off, cupped, and/ or flat spots. The 919 is very neutral feeling in its steering feedback thanks to its lazy geometry.
Karl, you're over thinking this. It's ok, breathe. Remember, "K.I.S.S." If it ain't broke, don't fix it. Also, if you're having s hard time telling if your tire has issues visually, feel them up. Beyond that, I strongly advise you to find a motorcycle friend that is knowledgeable and have them help you through your suspension.