I have down-loaded the PDF. But I thought somebody might have done the equivalents. With my 34mm Mk2 Amals, I use 6D Mikuni needles which are the leanest. I cannot whack the throttle open, but those needles give the best acceleration. One thing I have found with the Commando 850 motor is it tends to spin up at the same rate regardless of the overall gearing. However if you get an improvement in pulling power, you do not usually know it until you raise the overall gearing. When your overall gearing is high, you usually use more throttle, so the taper on the needles has more effect.
I use a close ratio gearbox, so as the overall gearing increases, the gears tend to spread, but smaller steps between gears means smaller loss of revs and I come up through the gears.
With most motors, as you raise the overall gearing, they tend to accelerate slower. The Commando motor is different. You don't find out how fast it is until you raise the gearing. The steps between gears in the standard gearbox are too large. As soon as you lose revs with the heavy crank,, you need to wait for them to come back.
I think with Commandos, a lot of things were done to cope with the worst case scenario. The taper on the carb needles might have been specified to cope with heavy-handedness.