My experience with carbs rebuilt by Gerben, it was for 022A set, jets 40/100. All brass original Keihin.
As said here, Gerben work looks very good (even I'm not a fan of polished bowls).
However, funcionally vise I was never able to achieve good idling despite a lot of sync tries. Additionally, behaviour at lower RPMs not good (felt like too rich). First I replaced slow jets from 40 to 38 (new NOS Keihins). It improved a little but still, running engine between 2500-3000 felt too rich and rough.
Having cabs off the bike this spring and reading some forum thread pointing to sensitivity of emulsification tubes plus fact that my tubes were falling off the carb bodies when main jet is removed, I checked them into detail and compared with keyster replicas I bought some time ago.
Guess what - I found internal surface of hole rough / corroded.
As all outside dimensions and size/position of holes on tubes were the same as on Keyster replicas, I decided to put them in (I had to push them inside with some force, so they do not fall out by themselves). I did not change needles that required additional dissassmbly.
After bench sync only (bearing balls method) carbs installed - whoola! Bike idles much better, chain rattle almost gone. Additionaly runs great, smooth on lower RPMs, I can easily "cruise" on ~2500 RPMs and engine picks up easily w/o hesitation. So only simple change of tubes change bike behaviour a lot!
=> before deciding to use original old used tubes, check them inside. In this specific case originals are not always better than alternatives
Attached pic comparing new Keyster (left) with OEM Keihin