I have the 4.10 k270 on my bike and I'm impressed with it. I run the heavy duty tube also. The 270 seems to throw up quite a few rocks and gravel.
I just replaced the stock front tire on my '01 TW to the K270 5.10. One thing I noticed right off is that is a much heavier tire. Seems to have good traction but I definately noticed the "gyro" affect from it.
I suppose one could reduce the gyro effect by going to a lighter tire, but then it wouldn't be a TW, would it? TWs don't really go fast enough the gyro effect is a problem, it just takes a little more muscle to countersteer. Anyone with insufficient strength to countersteer shouldn't be riding in the first place. Yes, the "feel" is different, but it isn't really a problem, and one grows accustomed to it after a few curves.