So I've had a little play and its still not playing ball but its hotter than the sun in my garage at the moment and il have wait until its cooler then hit it.
By memory in the Fanuc manual the numerator and denominator are used for gear reduction and in the Adtech the manual states :

" When screws of different pitches and motors of different step angles or servo motors of different pulses are matched or connected through gears it allows keeping the program and actual motion distance consistent through electronic gear ratio setting of the system. "

So I've thought this meant by the first part of the statement that the motors and pitch ( with the calculation ) would be needed for the setup but you could also read into the second part , that this setting is for gearing the motion . Even reading Fanuc manuals usually leaves you scratching your head if you overthink the use of English and this manual is no better.
With the quick go the 1/1 its not even close to measurement and 1600/320 was interesting until it didn't move at all , but i need to get in and play more when cooler and have another scan through the manual .
Thanks