Moving to strictly night aeration will help keep your temps from rising. I had to back my start time to 11pm to give the surface temps a chance to cool before it got mixed in. Your temps being so close top to bottom is a good indication that the pond is getting at least one full turnover. You may be able to reduce your run times even more to allow your temps to cool more.

.10 surface acre pond, 10.5 foot deep. SW LA. The epitome of a mutt pond. BG, LMB, GSF, RES, BH, Warmouth, Longear Sunfish, Gambusia,Mud Minnows, Crappie, and now shiners!!...I subscribe!!