Snake,
I have the same bike, its modified to a 265 but the jetting didn't change much from stock. I'm currently running a 50 slow jet and a 158 main. Adjusting the needle with this setup covers a fairly wide range of changes in temp/humidity. The weather between here and DFW are very similar, so it should get you close. BTW I'm running 40:1 premix.
If you are in the tight stuff and haven't already, try a 50 tooth rear sprocket, BIG difference. :thumb: Yes, it does take away from the top end. :ugg:
I wish someone made a shorter first gear for this bike.
Good Luck,
Scott