I dunno what the real "forumula" is for working this out, so I kinda just did some trial runs to get my KX dialed in. I went to a 128 main jet (for summer), dropped the clip one, and adjusted the air screw also. I haven't touched the other jet. However, I'm riding above 8000 ft, it's not humid at all, and I've got aftermarket head/exhaust/reeds, so I don't know how that would compare to your bike. Also, I carry a 125 main jet for riding mtn passes and re-jet mid-ride sometimes. One note not exactly about jetting is that my bike was still real spoogy even with that setup, so I changed from 32:1 to 40:1 premix and the bike runs much better now with less spooge so I don't have to repack the pipe every two seconds anymore.
Where (at what altitude) are you located?