With 2.68 straight cut primaries I used TZ's on both the clutch and stator side but with my sustained high rpm 1/4 mile runs light brown color always showed up on the inside races. In never saw any galling but the color obviously indicates skidding and heat buildup. With barrel rollers they have more drag also. I'd pretty much decided on going with Max loads even though they're prone to cracking races if subjected to detonation which I sometimes get with my alcohol motors and they don't have near the TZ's load carrying capacity but for better or worse I ended up going ceramics this time. We'll see if that was a wise decision or not!
Personally if I was doing a gas trail type motor I would go either Koyo or Max loads.