Ya chucking the needle can do wonders, like thinning it just a pinch before the pipe hits down to the tip.
So it has the mix it needs, with some to spar for running down hill on the pips roll on/start of hit, and not being to lean.
It takes time but i can make A SHA better than most can tune a Bing.
you can change the number of screens on the SHA to to tune in mid=WOT.
Run two to fore on most. (edited)