CB350 Mikuni Jetting

Well I have been struggling to get my bike tuned right over the past few weeks. I used the Ohio site to get a general idea on what kind of jets my bike would need, but after switching and swapping I'm always running lean or rich depending on needle or main jets, when I hit about 6k on the rpms.

Here's my list of mods. Todds pistons, New Cam chain with slipper tensioner, Megacycle 123-20 cam, and Mikuni VM32 Carbs with velocity stacks.

If anybody has a similar setup and could throw me a bone on where to find a better start, or if you have any better ideas.