I suppose what works best for you is universally applicable to all.
I ride 81" and at times feel like it is too low...I spin plenty fast with that gear ratio, even over most hills. That doesn't mean it is for everyone.

Here's the bottom line...no one can tell you which gear ratio is going to work best for you, and asking about a specific ratio in BF is a fruitless exercise. OP should buy a few cogs and experiment.