Although I don't have SRT I do use IRST. Test using utilities showed that there is a great increase in the raid hdd speed. However, doing an actual file transfer using USB 3.0 showed a drop of actual speed from 40 or more mbps from a previous configuration which does not use IRST. I used to get using USB 3 ports from 40 to 170 mbps file transfer speed but now with IRST installed I only get utmost 80 mbps.
It seems the problem is with IRST which is also use in conjunction with SRT in your case. BTW I'm using Windows 7 64bit.