Well, I hate to say it, but it seems I can't mine this new CN Heavy algorithm properly. I was using SGMinerGM without much problems getting 4500H/sec out of my 5 AMD RX580's, but now it is horrible. XMR Stak gives me 3300H/sec, SRBminer 3800H/sec, but both miners will crash/get stuck/reboot within two hours. Tuning the miners with intensity etc only make it worse. I can accept the loss in hashrate, but not all these problems.