I agree with Paul. I get fine focus with the EAF on the shaft end of the Edge and the Esprit.
I compensate for backlash using the AsiAir Pro. Not sure you can set backlash when just using the hand controller as it is a software setting, but I dont think it would cause an issue.
The handcontroller i have and it works fine, however again i am not sure you can set a different fast and slow without resorting to software and you may be limited to whatever is programmed into the handcontroller. I can't comment on the 4.5 m cable as I only use the one supplied. From your signature I see you are only 12 km away from me in Glebe, so are welcome to come and try on mine if you like.
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