I just switched to Byron's 20% Gen2 from Byron's 30% Original on my 3 port Race that had about 1 gallon on it.

It still has a very good pinch but is broken in. I had a hell of a time getting a tune today.

I finally had to remove a .109mm shim. That helped a lot but it still seems to lean bog on the low end and doesn't have the proper snap. Suggestions?