Well I have done some tested this morning and I have confirmed my thoughts that the motor is not working correctly
At full throttle I am getting 1.23Kw @ 58 amps which is what I was expecting, at 50% throttle I am getting 200w @ 5 amps
not enough to pull the skin off rice pudding as they say !!!
Just checked the price of a replacement Hacker A50-16s, I dont think I will be buying a Hacker