I would take it completely apart again, leave it to soak in thinner for 24 hours then remove each piece, wipe it thoroughly, run cleaning brushes through all holes and cavities and interdentals in the small hard to reach places. I would even, very carefully, fit the needle into the nozzle and move it back and forward a few times, gently. If you have a suitable reamer, try that as well but always be gentle and careful.
If you have a CR Plus with solvent resistant seals then I would suggest a lacquer thinner, Mr Tool Cleaner being ideal. If your seals are not solvent resistent then you need to usesomething less aggressive depending on what paints you use.
When re-assembling, make sure each part is tightened, carefully of course. Then before replacing the rear body over the needle check the needle action and spray some thinner. It might also be an idea to add some lubricant to the trigger area.
These problems are almost always a cleaning issue, it is not just a matter of a blocked nozzle you can also get the needle 'sticking' and not moving freely.