I agree, your temps are fine, here's a snapshot of my idle temps in a room at 25°C, bearing in mind I also have a waterblock on the CPU and above the NB:


With regards to my rig, I now have the best CPU GTLs set to +10 for all 4, and got the memory to memtest overnight (26 passes) at 5-5-4-15 timings on 1200MHz PL6 strong, with the CPU at 400x9, but now blend test is failing a lot and have adjusted NB voltages to 1.33, 1.37 and 1.4 whilst testing NB GTLs at each voltage, but nothing seems to give any hints for stability, all combinations give rounding errors around the same time (give or take a minute)..The most successful I noted was with NB at 1.33 and NBGTL at +60 which gave me 5 mins of stability and prime quit, 1.37 with +70 gave me rounding errors on 2 cores but kept priming the other 2 for a while longer before I quit it.

Am I going the right way about this?