The only other thing I can think of is changing to an Arlen Ness backing plate that has a better internal breather system.

From their site-
One-piece aluminum backing plate features our patented hidden breather technology. Each hidden breather is o-ringed at the heads and exits at the mouth of the injector/crab to provide efficient engine breathing, eliminating the need for any external hoses or hardware.

All one piece, no hoses like some, and they exit right in front of the butterfly.