I always get annoyed with two fans switching on and off, the sierra uses a similar 2 fan setup and the temps are dead stable, less fan noise etcetc.

So im thinking one fan is (at the moment before i test it!) going on @ 87ish and off @ 84 and the other fan is kicking in around the 100 mark as above,

As long as them temperature is nice and stable (ie doesn't constantly over shoot then under shoot) then im happy, and if it turns out i don't need to individually control two fans then i have a spare programmable output to do something with

Rob,