I'm only getting ~185 h/s on an i7-4770, with -t 4 and fast mode enabled. Am I doing something wrong?
No other miners started?

Try to reboot, start miner and do not start anything else at all, even browser, skype etc. If is still 185 h/s in fast mode and CPU load is about 50% (not higher) it means that fast mode does not work for your Windows or hardware for some reason. I have several systems on 4770 and they all show about 270 h/s (Windows 7).