hhhhhmmmmmm....... Can't tune the Go Carb and now Can't tune with the V-spec carb. Maybe the Go carb was not the problem. Hope you get it worked out but I think too many people give up on the GO carb because of what people say. I have ran 4 Go motors with Stock carbs and no problems also 100% of people I know in my area ALL use stock Go carbs that run GO's.
Sometimes what I do if I come up with a problem and cannot figure out by tuning a little at a time is to go from one extreme to the other. For example Turn the HSN one FULL turn richer or leaner and see what it does. Same for LSN. Most of the time you will see it run better one way or the other (not run the RIGHT way but better). This will give you a indication of where you need to go Hope that helps a little.
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