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It depends on a lot of things. The tires themselves may be designed for higher pressures. They won't stick worse necessarily with higher pressures, but they will likely last longer. I used to get close to 15K miles out of a set of Diablos on my TT600 in regular commuting duty. I ran fairly high pressures, but I don't remember what they were- 36/41 as I recall. Other tires with stiffer sidewalls, like Dunlops, use lower pressures. If you use pressures too low, handling will suffer. ST3s are not full on race reps, so the tire pressure recommendations are probably more for touring type riding or commuting as opposed to scratching. When in doubt, I would go with whatever the tire manufacturers recommend, and it is usually around 40 rear, mid 30s front.
If you take it to the track, all bets are off. Talk to the tire manufacturer's rep at the track if there is one. Otherwise talk to other riders and filter everything they say.
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