Also puts my hashrate at around 5.9 with the i7 7700k which should apparently produce 8-11 H/s.
Any idea how to fix this?
Probably... use linux :-/
Those messages are just warnings -- means, the OS isn't letting those "hashers" take ownership of a CPU thread. Could be other programs already have a lock, could just be the operating system.
whats we should expect with a i7-7700 CPU?
Depending on OS, 5-10h/s