The 1000 is NOT overkill. 1600 watts would be 50w/sq ft. The limegreen on the top of the plant is probably from the heat. You said you went from the cool veg room to the hot bud room and 12 hours later you noticed the change right. Usually look at the newly changed things for answers. Maybe just a shock, maybe adjusting to 1000 w light after coming from T5's. Anyway I would keep an eye on them and see if the problem gets worse, I would not at this point start throwing nutes at it though. One problem at a time. If you can vent that air out of the shed that should help your temps. Also CO2 will certiantly help with those temps, not neccesssary but would help...just my 4 dollars.
Peace