That does sound weird, so I will offer a weird reply
Jetting is not lean but won't pull 2nd gear? A good strong low-mid range is what GG engines are known for - especially with the RB mods. So something is definitely off. Is it pulling strongly in other gears? Did it act this way before it was ported?
If it
was a lean bog you would have to richen/raise your needle, not drop it.
I would suggest checking your reeds. I once chased what I thought was an electrical problem (bike would start every 20th kick) that ended up being chipped and broken reeds.
While it seems like bad reeds would affect the upper rpm range as well, sometimes weird things go on...
Jeff
(
https://thumpertalk.com/forums/topic...-bog/#comments) note approx. post 15.