My 67mm standard B6 setup for OCRC indoor clay is posted here too. The main thing I've found for laydown 67mm is to run on the C 1-up, D plate middle. 6mm hex adapters. I also run more droop.... the long ends on the tall tower OR short ends on the lowered Schelle tower. I have run the Schelle aluminum 67mm bones on both mod and stock for OCRC with no problems.

Most team guys run very close to this setup, some prefer gray front springs, waterfall vs. pivot rod, and sometimes 2x1.7 rear pistons. On the rear hubs you can run the 0 axle position with 2mm spacing on the Schelle hubs, that's the other common setting. I prefer the #1 pin insert with 0mm on the ballstud. It has more predicable side grip that way.

Source:

K. Wenger