In general, I have found that Veloflex clinchers and tubulars have far shorter service lives than the factory estimates. At 57kg, I'm not pushing the weight limits of any equipment on my bike, tires included, but I've found that their rubber is good for about 60-75% of the estimated "lifespan" before visible tread degradation, cuts, and puncture vulnerability become unacceptable.
Not wanting to sound like a broken record but you should be able to get about at twice as much as the expected mileage announced by the manufacturer if you'd age them properly.
Of course riding style and the idiosyncracies of the geograpical location where they're used is a factor as well but still. All in all I find the manufacturer's estimations very much erring on the conservative side.
No need to rotate tyres when using tubulars (it is too much hassle doing more damage than good), just retire the rear one when needed and replace by a "fresh" one.
Where I ride I just can't use Vittorias as they just puncture regardless of age and abuse due to them having this nasty propensity to burry small flints inside the tread.
Just for the record, I hardly ever puncture Veloflex tyres. No more or less than I would say a Conti Comp anyway...