I can't remember if Spec7 lets you swap jets. If not, you can always play with fuel pressure as a method of mixture adjustment.

Now for the strange idea... Put your regulator on the firewall as close to the carb as you can get it. If you happen to put it on the driver side firewall where its EASY to install, this weird problem crops up. The Fuel pressure goes up turning left, goes down turning right. Centripetal force = height to gasoline. Not a huge problem, unless you're trying to run 2 psi....