I ran the 29.5 M/T's through one set, but didn't see any big difference to speak of. There are two 30x9 M/T radials now, with slightly different rollout & treadwidth. I just run the "biggest/widest" one.
The best 60' I've ever had with my H/CM Volare is a 1.41.
The very last run on the tire pictured below was a 1.419. M/T's -- good to the bone!