Teebo potency required for T7 Rancor?

Thanks guys. My Teebo with 147 speed does OK on T6, I broke up a potency pair for a +21 speed. I'm not sure if I should try on T7. Current potency is only 31.5.

I run Phasma, QGJ, EE, and Rex (Rex is 6 stars but will be 7 if credit heist ever returns). I can miss/unstealth/get resisted 3 times and still get a chance to reduce TM.