GPU1  76C  Sol/s: 286.3  Sol/W: 3.26  Avg: 285.0  I/s: 154.4  Sh: 1.01   1.00 159 +
   GPU2  78C  Sol/s: 288.5  Sol/W: 3.28  Avg: 284.7  I/s: 153.8  Sh: 1.07   1.00 166
   GPU0  74C  Sol/s: 293.8  Sol/W: 3.26  Avg: 286.5  I/s: 155.0  Sh: 0.80   1.00 157 ++
   GPU4  76C  Sol/s: 281.8  Sol/W: 3.24  Avg: 284.2  I/s: 153.0  Sh: 0.91   1.00 141
   GPU5  75C  Sol/s: 291.0  Sol/W: 3.24  Avg: 284.4  I/s: 153.1  Sh: 1.00   1.00 161
   GPU3  77C  Sol/s: 287.3  Sol/W: 3.29  Avg: 285.8  I/s: 155.0  Sh: 1.13   1.00 154
   GPU6  77C  Sol/s: 283.9  Sol/W: 3.31  Avg: 280.2  I/s: 152.6  Sh: 0.98   1.00 156
   ========== Sol/s: 2012.5 Sol/W: 3.27  Avg: 1990.7 I/s: 1076.9 Sh: 6.90   1.00 156

I personally would sacrifice a few sols to keep my temps below 70. I have 3 1060 3gb and get around 275 at stock. Are your cards too close together?