@Corbet, you inspired me to work on my Pitbulls some more, since tons and stickies are losing out to all the other things that need money around here. I deepened the existing grooves, and grooved every lug I had just siped before.
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I'm not a weight weenie, at all, when it comes to tires, but this effort did put them on a diet:
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I was doing it in my 50* shop. I could have gotten it warmer, but was having to work hard enough that I didn't want the heater on. You'll figure this out, but a respirator is your friend, as is ventilation. No pun intended, but you're literally burning rubber, and only a few inches from your face.
Mark