150 cfm Delta is doing most of the work - not THAT much less airflow than the 190cfm stock S5 delta. I'd guess JUST replacing the stock fan with that 150cfm unit would increase your hash board temps 2 degrees C or so with no other change.
there is no way the difficulty isn't about to explode with the S7 and KNC's gear when it launches
S7s appear to already be in use in Hashnest, per all indications that's what Bitmain replaced their Hashnest S5s with (you know, the "used" ones they sold for a month or so?).
KnC claimed to have their Solar stuff "in production" months ago - didn't they announce tapeout EARLY this year?
One thing about difficulty - the faster it increases, the faster old inefficient miners get dropped, which will limit the rate of increase at least some. I won't be supprised to see the average kick up into the 2-3% range, vs. the 1.6% it was averaging for this year prior to the "used S5 sale", but I do NOT expect to see 5% figures ever again except as a one-shot followed by a MUCH smaller jump on the next increase - and possibly not even then.
Do keep in mind that if the "best gear on the market" isn't profitable for someone they'll tend to turn it off - which is a MAJOR limit on how fast difficulty can climb. When the S7 is unprofitable at 10 cents a KWH lots of folks are going to be turning them off.
Even some of the major FARMS pay more than 6.5 cents / KWH (I only get 6.7 (I refigured it this week based on my CURRENT electric bill and "additional charges") as an "incrimental" cost past a certain number of KWH during the non-summer months).
Also do keep in mind just how MUCH existing hardware is already hashing. It takes a LOT more to "make difficulty explode" now than it did even a year ago.
