That carb is similar to the ShengWay 20mm carb that Trailbikes (or TB Parts) sells. The TB carb comes with a #35 pilot jet and a #89 main jet, replacement jets can be found
HERE and
HERE.
Have you tried the carb with the jets it came with? You may find that the jets in the carb you have may be close, and you may only need a main jet from
HERE in order to dial your carb in.
The Chinese carb makers are not consistent as far as using the same jets for all of the PZ20 carbs, as you have found out. Chances are, running a #90 main in your carb will not work right, even though it is recommended in the Shengway carb, if that makes sense.