I'd go for the KHE Collapse is anything, as it's apparently stronger than the Kool (plus they look cool as f**k (N)).
If you didn't keep the Claws tight, it's understandable.
Other than that though, if you're breaking tools it'd suggest you weren't using them super well (I don't mean that in a "You knob head!" way :-), which probably leads to chains that aren't joined properly, meaning they're more likely to die.
Do you preload much before doing moves? If you do, it generally increases the life of your drive train as the pressure is applied in a much smoother way, not just explosions of power repeatedly, which will lead to the freewheels/chains dying.
If you've got the cash, try getting the Eno freewheel (or if you've got 3x THAT amount of cash, get a Profile :deej:). They're pretty damn burly so you'd probably get along with it better :P Plus they're a doddle to maintain 'cos they barely ever come undone and even when they do they don't explode a la Claws...
Mark