If you can, try connecting via PS2 connector, I read in all the reviews of mechanical keyboards they work better via PS2 which seems odd but is apparently so. Something to do with how many quick keystrokes they can handle before ghosting though tbh I didn't really take that side of it in, I was looking mostly at other aspects. I'm connected via USB and also have the twin USB hub on the keyboard connected.
Which means I now a total of 8 USB ports available to me - two on top of computer case; two on keyboard and four on monitor. I rarely use more than 2, mostly for sd card and external HDD dock.
As for my Mionix, having no problems at all, felt odd at first but now I'm lovin' it