Yeah, Ive always used 18A Turnigy ESC's in the past and never had a problem, these HW ones are supposedly the same ESC's as Turnigy plush 40A. so thought they would be fine.
As I recall the sliders are all going to the ends but I'll check, thanks Kloner.
Something I did notice, was that the LED would double flash amber when I did the CSC command, I think it did it with any stick input actually.
It must be something in the Naza settings.
Off to sea tomorrow unfortunately so it will have to wait.