4 200w CFL bulbs in one hood? Wow. Might need to use the vaccuum to suck-out that kind of heat, lol. Do you have to run all 4 at the same time, or can you unscrew one or two till plants harden-up to the heat? (a week or two)

Seedlings don't need light till they break the surface. But yes, 91 is likely too warm. Would move 'em asap, or turn-off the lights. (but turn 'em back on when they sprout) 80ish is max I recommend for germinating seeds.
Have you tried different combinations of lights? Finding out what you can do to lower temps when ambient room temps rise, is a good thing. You can remove one light, or angle the bulb so they are closer together when lit, or further apart, or another fan when necessary. Try different things to see what is the best you can do when it gets hot.

Every growbox, growcab, grow shed and grow room are different. Different shape, volume, different contents. There is somewhat an optimum set-up for each. You have to fiddle around till you find the best 'cooling' technique for you, and use it when necessary. Tiz a good idea to check the temps in different locations of the growtent, too. Dead spots (trapped, stagnant air)heat up quickly.