Misting system

hi, ive recently had a problem with 3 out of the 7 plants i have wilting. it looks likes the tips of the plants have just lost their backbone all the leaves have just lost their spunk and are wilted on those three the other ones are pefect. i have them in an eben flow system. i was thinking it was because of the heat which was cruising around 80 - 85 so i put more fans in and they dropped the temp. it also could be overwatering. n e ways i set up a misting system above the plants and put it on a timer, it seems to drop the temp is this a bad thing to do? will misting the plants have a negative outcome? it drops the temp almost 10 degrees

Over-watering usually look's like a combo of several deficiency.Maybe check too be sure the lines are not clogged...they may not be getting as much water as the others.