I found your procedure very good.
If that can help you there my setup with tmx 38mm carburetor

I use tmx 38mm on my lt250r 1988, fmf pipe/exhaust
I have porting, boyesen ported intake /reed. well oiled uni air filter using maxima air filter oil.

25 pj /410 mj with removed airbox lid
27.5 pj / 380mj with closed airbox lid

the jet needle is s-7 and don't remember the need jet.