@Phoenix

It's a bit overdue but thanks for the EUREKA moment.  I always noticed my miners dropping over night but never could figure out why.  I spent a lot of brain power trying to get the temps down, never even dreamed of going the other way.  After reading your post i reverted back to closed case, window closed and set it to run for 12 hours.  All 3 jupiters improved 20-40 Gh/s.  I've repeated this enough times to believe it's not a coincidence.  For anyone receiving new miners, it's definitely worth a try to run them in the 60s.