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best performance is gained when the fuel/air mixture is closet to ideal for any given rpm point. stock jetting (on a stock bike) is lean on the bottom/midrange and rich on the top.
once you start making changes to intake/exhaust, you need to keep searching for the best combination of main, needle and pilot jets that provides the closest to that perfect air/fuel ratio.
add the fact that you are working with an exhaust with no R&D time on a dyno and my feeling is that the design of the pipe may be providing you with less power than a pipe from one of the major manufacturers. Pipe design is a blend of mechanical principles and black magic. It's not as simple as making something yourself and expecting the same results as a company that has invested time and effort to produce a product which provides the engine to make as much power as it's capable of.
to that end, you need to keep searching for the main jet size that will allow the engine to run in the sweet spot. gl... you're doing the R&D that most (some???) pipe companies go through before they release their product to market.
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