I can't see how the Kama could be better is all I can say, the SS has matched the Noctua fans and keeps my cooler and CPU cool effortlessly. I've never used a Kama myself. I would only have doubts about the middle position on the heatsink, as it is very restricted both on the intake and output sides and no doubt gets hot for the fan. I would probably prefer to get ball bearings there, in fact - the Gentle Typhoons should do well (read SPCR reviews and compare).
Idle is fine, typical even, especially if you run low RPM. Getting under is 30 tough without very cool ambient, and even then it's not really any more beneficial than under 40. 62 °C in torture test is pretty high, though, considering the CPU has its Tcase at 67 °C. It's not alarming, but I would raise RPM and make sure airflow is going, just to be safe. Then again it's torture testing, and if you don't usually stress the CPU or overclock it, it might as well be fine.
Case: Define Mini
Parts: P8Z77-M Pro µATX, i5-3570K, N650Ti-1GD5/OC, 8 GB G.Skill DDR3U, Xonar DX, WD G 1 TB, mx100 256 GB SSD, RX-5300 PSU
Cooling: Noctua NH-U12P SE2 + Scythe SS PWM, 2x Noctua NF-P12
Extras: Eaton UPS, Dell 24" EIPS, Ducky TKL, SteelSeries Sensei Raw, Synology DS213j 6 TB NAS
idle-load: CPU 32-44 °C @ 300/600-600/800 RPM, GPU 35-65 °C @ 1200-1650 RPM