We've actually tried it both ways, with a couple different sets of domes. No matter what setup we did the small-bore pipes would back plugs out after riding about 10min of riding.. We did 175lbs compression, 155lbs, 135lbs, +7, +4, Stock Timing. All the domes were cut by Tim @ Titan for alky. Once we moved over to the big-bore pipes the problem went away. (This was before I got this particular cheetah) Now that I have it, I'm running 150lbs compression, +4 timing, and the big-bore pipes. I am actually really happy with the big-bores on this setup. Between the small-bore shearers and the big-bores, the big-bores "feel" like they have a lot more mid-range and "feel" like they use the powervalves more. These cylinders have an aggressive dune port from Brandon @ Wildcard.
Jared