Yes phillip is a tinkerer trying to get the best watt/gh ratio with low noise as possible. Its a refreshing approach, not one everyone always considers, but he'll probably be mining long after we give up from electrical costs 
I have to live with my miners too.. oh, and believe me.. I'm all about the underclock and the tinker..
I think out of the gate its pretty well understood that the design of this miner and the BM1384 is such that it has a narrow overclocking and underclocking potential when operating at 12v (In terms of watts per gh).. if he had his hands on a 9V 10A PSU, I would applaud him doing underclocking tests... and would bit sitting on the edge of my seat to see what he discovered and shared here. mod it up with a silent high flow low rpm fan.. neat! Thats the mod I want to see...
I'm sure there will be some in depth S5 modding thread(s) coming.. unless this one ends up being it..
Anyway, I'm interested to see where this review ends up in summation and final thoughts..