[Chaz]

No need to do a pinch test, to be honest thats a load of bollocks and to many variables from where you pinch the line.

Get the engine up to temp on the box with light blips n full throttle. Once its at temp give it full throttle a couple of times. If it smokes loads lean the LSN . You'll know if you go to far by leaning it because the engine will stutter the accelerate. Then set the idle. Dont listen to the yanks going on about idle gap, every engine is different and must be set accordingly with the tuning of the LSN. If you lean the LSN you should turn out (richen) the idle. Generally little tweaks here and there on the LSN wont really effect the idle. Im not sure what engine you run but i know on the Reedy's you'd set the idle so as soon as your off the gas it doesn't hang at a 'high idle' it just goes straight down. Thats pretty much the same with a OS. Ofcourse if the HSN is way rich it'll mess about with the LSN but setting that is fairly easy. A way i used to do it was lean it and hold it at full throttle for 2secs. If it was lean it would wanna shut down. So you just richen it until it just wants to carry on. The way you talk about tuning the HSN is good though and you can't go wrong with it.