There's probably still a lot of nutrients in that soil... did you flush it out? (Flush = watering with 3x the amount of water in relation to the size of the pot)

Your temps are also pretty high, try to keep them below 85. Do you have any other lights that you can use? Maybe a couple CFL's until they start to look better again. Otherwise raise the light, they need a little TLC for the next week or two until you see healthy new growth again.