I've got to switch to something thicker than type f ATF fluid because it's seeping out of my seals. Until I can replace the seals what's the best gear oil to run in your opinion Motorgeek? Price don't matter and neither does change frequency I've been changing my gear box fluid after every two rides.

Just change the seals or replace the surfaces the seals make contact with.  You are wasting your time trying to stop the leak by using thicker oil