the units hasnt been OCed, and regardless a brand new unit from bitmaintech, i found dusty heatsink which indicates its being mined for weeks before sent out.
Man, those are the best HW% I've seen yet. Not even 1%. You shouldn't worry about those numbers.
It does look like your temps are quite high for those fan speeds though... what's your ambient temp there?
My longest running one right now is 9days 19hours 122,280 HW 40,161,291 diffa 42,943 diffr 35,202 discarded 339 rejected fan 2640 44C/42C with puller fan
even though those errors are low, my mindset is these need to not break down and heat is the #1 reason they will break down.
Not sure how much space you have, but I found this to be most effective; with fans on the outside blowing on the chips: https://bitcointalksearch.org/topic/m.4920949
One (2014) sits at 39oC, fans around 2000rpm and .55% HW errors, the other (2013) doesn't like to go over 387,5Mhz, with the fan at 720rpm and temps at 40oC and 1% HW but that's one's another story...
P.S. I now actually have 5 extra fans per miner, 4 on the sides and one pulling out front... those are old photos.