[Tongue Pirate]

I have never dealt with Jet but I do know that carb settings aren't something you can just punch into a computer & have it come out perfect every time. Carbs are mixing boxes that attempt to mix air & fuel depending on "your engine's" needs. Every runner, piston, manifold, cylinder, valve, cam combination are going to react differently to each other & inconsistencies in each can compound changes in needs.