I know you know your way around a race track so I won't insult you by saying check your pressures, but it could well be suspension based. I've seen a 900SS knacker a set in a track day, but my superlight lasted a whole season (5,000m) including 5 track days on a set, something I'd credit to well setup suspension. They were well and truly gone when I ditched them but they didn't budge while on the bike.
The one major issue I've found with them is that track use tends to push the carcass left due to the prominence of right-handers, but they're a road tyre so you can't blame the manufacturer for that. I've tried a number of tyres with the ss chassis and Diablos suit me down to the ground, but I think that's more to do with profile/construction than the rubber.
If you're really hacked off I should take them to Pirelli and ask why they died so quickly. Even if they were corsas you should expect more wear than that.
Cheers,
Ali
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