Just to add to my (albeit limited) experience with my S33's - I run them no higher than sidewall pressure, which is 115. On Hellyer I ride them at 110, at VSC 115. The Sprinters I run at 140 -160 at VSC, 130 at Hellyer. The S33's show little if any wear since I started riding them at Hellyer in November, and I've done 45 training sessions, plus warmups in four mass start omniums on them. Zero complaints from me!
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"Can you add a signature line please? The lack of words makes me think you are being held hostage and being told to be quiet"