Worked a bit around with your solutions and stabled on the following:
- Stock launcher frozen;
- SetCPU profiles:
- Screen ON/unlocked: Governor OnDemand (1200-800) with Noop Scheduler
- Screen OFF: Governor standard hotplug (800-300) with noop scheduler
It looks like moto_hotplug governor doesn't work quite well but I also noticed some glitches on systemui.apk. Whenever you turn your screen on and unlock doesn't show smooth you must turn off screen and try again... if you unlock with a laggy unlocker the whole system will be a mess.
With those setting I'm not having reboots, just some lags here and there; battey, however, lasts much less due to ondemand governor.