I'd try a 6-2 for a quick test.
You can also "foam" your fuel at the right rpm. The jetting can be fine but your fuel turns from liquid to foam in the bowl, that feels like a lean issue. Sometime you switch from a Tron to a 44 Mic and it's fixed. But it was the mass of the Mic 44 that fix the vib problem, not jetting. If you can put it on a dyno with fuel flow reading, you can see it jump all over