Different Keihin Model Carbs on Cb350/ carb troubles

Reliks

Ride like lightning, Crash like thunder
1972 cb350k4 twin
2into1 mac exhaust
uni air filters

I've been having trouble getting my bike to idle right and i realized i have two different model keihin carburetors on my 1972 cb350k4 twin. There a 722A on the left side and a 3D on the right side. (whats the difference exactly) Would this be causing problems? They are jetted the exact same currently with #68 primary and #105 secondary. I can ride the bike around town but once its warmed up i have to give it some gas at stop lights to keep up the idle.
I've been chasing these tuning bugs for months.

Anything helps?
 
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