Wow thanks Pete_X really appreciate this. I got my Samsungs up around 1015 h/s at 110 intensity with your settings. Still working on the Hynix but I'm hopeful I can get them there too now. Please DM me your BTC address! 
Just pick a card to play with and raise Intensity one by one. Normaly the Samsungs should be around 1000h/s at +-105 (18.4.1 that is). 1050+- should be around 115. All that with 1200Core and 2050Mem. Raise these two only after you found a stable Intensity that the cards like ... You'll note that you are close to the right intensity if you get a flat line with no fluctuations after 1-2min ...
Hynix ... we'll get there. Samsung 1st
DM send - Thanks !