With the latest build hashrate is really high according to ccminer. (quark algo, yaamp, linux, 970/750ti rig, 50 and 52 capability)
Yaamp reports similar hashrate first but for a longer period the hashrate is lower compared to the eg. 43 version.
Hashrate reported by yaamp is lower even without -g parameter but with -g the difference is more significant. I tried with -g 3, -g 4, without intensity setting and with -i 22, I increased difficulty but the result was same.