You may well be correct m_c but it is the slow response which is bugging me
Very slow to ramp up, (never used to be) , and when it does respond it seems to give required torque to hold a cutting load,
but if the load is large and dragging it down ,( as in threading) it seems to get dragged down before it can respond so loses in the catchup race .
The fact that I cant reduce the ramp up time suggests to me it is the response of the drive to AvF that is letting it down,
Motor is running like a dream otherwise .