The little chart that came with the boyesen reeds was really helpful for me to try and figure out jetting.
The big breakthrough for me was getting over the idea that jets are related to RPM, they aren't, they are related to throttle position (though a throttle position can be problematic at one RPM but not another).
Mess with one thing at a time, and assume nothing, and don't forget to adjust the needle clip position. Resign yourself to the fact that you will remove, tweak, and reinstall the carb something like 20 times before you are done...