1) Have everything possible outside your grow area. Ballasts and fans make heat.
2) Pull your air over your light instead of pushing. If your light isn't completely sealed the fan will push hot air out into your grow instead of sucking hot air out of your grow and pushing it outside.
3) Have a dedicated intake and exhaust just for the light and another for the grow.
4) Intake close to the floor and exhaust near the ceiling, since warm air rises.
5) Get rid of as many bends, elbows or T's as possible, and get rid of as much of that cheapo coiled dryer ducting as possible. Both drastically reduce air flow. You should be using real duct, available in 4 foot lengths at most home improvement stores. The only time you should be using the flexible stuff is when the ducts are attached to something that might need to be moved, like a light.
6) I don't know how they get away with it, but the cheaper fans do not move the CFMs that they are advertised to. I've heard of one good fan outsucking two of the cheaper ones with supposed same CFMs. I like CanFan and Vortex. Vortex is the only brand in a grow op that will guarantee something for 10 years.

92.4 is not good. Transpiration can slow or stop above leaf temps of 80, which means the temp at the canopy should be 82 or less.