It is "possible " to have worn needles on a high mileage bike. So, if you have shiny spots on them, they could be worn, as could the jet needle orifice in the emulsion tube.
The needles should have a number on them. Not sure without looking it up, something like 2703, if they are Honda parts. If they are not Honda parts you can only tell from measuring the needle and jet for size, tapper, etc. I have some measurement data. But, I'll have to search around for it.
How about your air screw needles are they hollow tipped, or solid tipped. Stock was solid.
Cheers,