You results looks strange. Why you are not using Teamredminer for AMD cards? A 6900xt can get around 20gh depends on the overclocking. And why hiveos always show 1000mh for your gpu´s? For me rigel1.4.4 show the correct hashrate!
This is an error of incorrect display of the hashrate in hive OS. I wrote about this so that miners check the hashrate through logs or on the pool.