Vintage Dirt Bike Q & A

I am having difficulties with the jetting on my 1980 cr250 . I am using the stock keihin carb ,71 mm bore ,boyesen dual stage reeds, circle F pipe.
I realize the reeds make the engine run a little rich on the main and lean on the pilot . I have dropped one main jet size and turned the air screw.
However , it still seems really rich at high rpm and extremely lean at low rpm.Has anyone had the same difficulties ? I am at 615 feet above sea level and run maxima castor at 38 to 1 with 93 octane gas. Also has anyone dropped kicked the keihin and bought a mikuni form one the vintage suppliers . If so, what size of mikuni and what jetting . I see some places advertise prejetted carbs . Would this be a custom application for altitude , application etc? Sorry for the long winded question
any input would be appreciative.
Thanks

Jetting for 36mm Mikuni VM roundslide carb. This works in SoCal so sea level up to 1000' and 75-85 degrees F.

Pilot 35
Air screw 1.75 out (could go in a turn and use a 30 pilot)
Slide 2.5
Needle Jet 159-P8
Needle 6FJ6
Clip #2
Main 360-380
Float height 19mm

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Michael Stiles
1979 Honda CR250R Elsinore | 2006 Husqvarna SM510R | 2007 Service Honda CR500R-AF