That sounds very good to me. Low temps and safe voltage. Up to you whether you want to take the time to stability test at lower voltage.
Skylake seems to be a very forgiving processor. Today I wondered if it could do 4.5Ghz at "less than 1.3V" and here are two runs of Asus RealBench at 1.28V and 1.29V and I think the score results will fluctuate with marginally higher or lower results running at the same settings. Not sure what to make of it vs keeping things at 4.4Ghz?
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Mon Apr 4 2016 20:05:11
(4.5Ghz @ 1.28V 90.55W 73c Max Load)
Image Editing: 197331 Time: 25.784
Encoding: 179560 Time: 53.397
OpenCL: 100032K Samples/sec: 2626
Heavy Multitasking: 184685 Time: 52.955
System Score: 145395
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Mon Apr 4 2016 20:31:06
(4.5Ghz @ 1.29V 92.01W 74c Max Load)
Image Editing: 197331 Time: 25.784
Encoding: 182014 Time: 52.677
OpenCL: 100032K Samples/sec: 2630
Heavy Multitasking: 183002 Time: 53.442
System Score: 145588
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