I like the higher yeast profile for hefes too, but have been cautious about fermenting too high. One of my favorite hefe batches was fermented at 71-72F, though. That was with WLP351. What is your preferred yeast for hefes?
I use WB-06, which I like for it's attenuation and lack of egg farts.
Some people under-pitch a hefe to juice the ester profile, but I prefer using a higher temperature. It just feels like a better choice for the health of the ferment.