I had much trouble getting a good set up using one and half jet kit on my RS500V3. Couldn't get rid of bad part throttle richness around 4,500 to 6,500rpm (this is far more annoying than you would suspect or it would be on a 250 as you end up in that zone for much more of the time due to the extra power and torque and are pulling out of a lot of corners (on the roads at least) like this).
The kit emulsion tubes are longer holding the main jet lower in the carb bowl (though you have to use the ns bowls) and the adjustable needles couldn't compensate enough. Having set up two other ns's with the nsr250 carbs using the ns400 emulsion tubes (and needles) and gotten much better initial results I would recomend that as a starting point. For my own bike (note not using CR cylinders) I ended up re-fitting the ns emulsion tubes and using the adjustable needles (B) though I have also gotten the main air solenoids of the nsr carbs working off the Suzuki/aprilia SAPC (suzuki TPS grafted on end of honda carb bank). The latter being worthy of note due to the rev, throttle position and engine speed related opening of the solenoids (via honda 'X' peices) thus leaning out at low to mid revs etc but not elswhere.
The latter is really an extension of my use of the Suzuki/Aprilia SAPC for ignition that I posted about on the ns400 forum ages ago and I should have updated that.........sorry.
There is a load of very good information on the main site here regarding what the various x peices do etc and the jet kit etc (think it's wrong about the operation of the power jets though as these are not solenoid controled with the appropriate passageway bleeding into the emulsion tube not the power jet passage). The carbs you have were designed to work alongside solenoids so you do have a ready made option to use them (though evidently they can also work without).
Allens (nottinghamshire UK) should also be doing custom needles now.
Hope that helps because if it does it will save you a load of time.