Ok, so i have disabled CPU fan monitoring in BIOS and fans are now hooked into chas-fan 1 & chas-fan 2.
Fan curve using t-sensor-1 is set to 50% @ 25c 55% @ 30c & 65% @ 35c.
Gaming & stress testing, Max water temp 33c with Cpu @ 68c & Gpu @ 45c with 54c hotspot.
Well pleased.
So a big shout for all help & advice