tranny oil.. need help, dont have many options

I don't know the answer to that, but I've had good results with Mobil 1 15w50 and Bel Ray 80wt gear oil.

I use Royal Purple 80wt gear oil if that helps.

You can run the Mobil1 Synthetic ATF. DRN member Cujet has been using that fluid with great results. I have several cases of it and have used it on occasion, and I can tell no difference between it and cheapo typeF in a 125cc. I'm for sure not a top level rider, but I use the clutch lots with upper range RPM's.

You can also use the 15w-50 Mobil1 and have no problems, however, all of the Mobil1 products are expensive. Do not let the cost of the fluid you choose to use cause you to change it out less often.
No matter what fluid you use, you should change it out very often...even before the fluid is "worn out".
If you are not a top level racer, you would probably be very satisfied with using any ATF.

You can also use a light grade diesel specific motor oil. Works fine, I use it and never had any issues.