Rich bog off idle?

Not a Commando ;
but My 318 loves a DP. Both with a 4-speed and also with a 904, and with any rear gear. In the 904, I run a 2800TC.
The next best carb I have found is a ThermoQuad.
I'm guessing you know that the Commandos were high-compression engines. And so hi-compression engines are more responsive in every way.
They say automatic equipped engines should run vacuum-secondary carbs. But I don't buy that.
Low-compression, low-rpm, smogger-slugs (like mine),with 2.76 gears and 1700rpm stalls? yeah that I can buy might do better with a VS carb. But not any performance combo. Certainly not one with a manual trans.
But; if you are willing to spend the time on it, a VS carb can do the job just fine on the street.
A couple of things to keep in mind are; the design of the engine determines how much air it will flow. As long as the carb is physically able to meet the demand, a bigger carb will not make it any quicker or faster.
And the engine, at WOT, doesn't care how many barrels is feeding it.
But, in a streeter, the carb plays a huge role in making a combo driveable, and fun; Smaller is almost always better.