For those whose XL2s go gritty, are you loading the lower cup with grease before fitting or just putting it all together 'dry'?
Also, I often hear people complaining that their headset's knackered (just generally, not talking about specific headsets here) but when pushed they'll admit that it doesn't actually cause any problem out on the trail – it's just one of those things that feels crap in the car park. A few years back I deliberately ran a cheap headset to near destruction (took about 4 years) just to see and right up to the point that the balls actually started falling out of it, I could never actually feel any difference when riding though it did feel terrible when just turning the bars while not riding. Obviously you need to ensure that there's no play but that's usually quite possible though it adds drag (again not noticeable out on the trail).
I guess what I'm getting at is that a lot of people get very precious about headsets when in fact, they have almost no bearing on the actual ride of the bike even when well past their best. CK and the like are nice to look at but really add very little to the bike beyond that (in fact, CK have a fundamentally compromised design with the o-ring seating for the top cap).