Carbs don't work on engine RPM, they work only on the throttle opening. To really see what is happening take a piece of tape and put it on the throttle housing. Put a mark on your grip or the throttle tube and mark full open and full closed on the tape, then divide the middle into at least 1/4 increments. This lets you look at the throttle while riding and easily see how far open it is. That tells you which circuit you are on when the problems begin. Your description of revs and low road speed does correlate to getting onto the needles when it bogs, but marking the throttle will let you confirm that.
Once you get it sorted well enough to run OK you can use the choke test while riding to fine tune things. I find it works best if you go onto a quiet back road where you can change speeds and tinker with the bike without having to worry about traffic. Get up into 3rd or 4th gear so the bike can pull a load without revving off the tach, let the revs fall to 2000-2500 and open the throttle to whatever circuit you want to test. Once it's pulling steady pull the choke and see if bogs, improves or stays the same. When you have it right you will get a very slight bog on the choke but nothing dramatic.
Mark
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