Target Temp 78 C
GPU +97
MEM + 415
Fan 100%

The main thing I am doing is I have my tower's fans all maxed out.  2 x 200mm on top, 2 x 200mm on front.
I also added 4 x 120 MM Fans and a fan controller to control them.
Each one does 3000 RPM and moves 120 CFM, I have 2 on the bottom and 1 in front pushing, and 1 on back blowing the hot air out.
Adding the fans helped alot.  Before that my hash rates were much lower, and my system wasn't stable, couldn't make it through the night mining without crashing.
Since adding the fans, it hasn't crashed once!
Air flow is key here