Balancing drivers to motors

I've been following this group for almost a year now and it has been a
wealth of information.

I have put together a Taig CNC mill. I am using Parker Compumotor OEM 650
drivers, and Pacific Scientific Powermax II M22 motors on X, Y, and Z, and
a M21 in reserve for A. My interface to the mill is TurboCNC. I have
varied the acceleration and max speeds to the point that I can either make
a 0.0005" move or a 10.000" move and both are dead on with the dial
indicator after repeated moves.

The Parker OEM 650, and OEM750 to the best of my knowledge, has the option
of varying the wave form from a pure sine wave to a negative percent of the
third harmonic. In addition, there are tuning instructions for Phase B,
and Phase A offsets via trim pots. This coupled with the Microstepping
ability of the driver up to 50,800 steps/Rev are leaving me some what
confused. The old mechanic in me the said "if it ain't broke, don't fix
it" is clashing with the thought "if I tweaked this, it might be better".

I have yet to do very much constructive work with the mill, but what I have
done so far seems to work well. I have got the backlash down to less than
0.001" and the ways are tight, but not binding. The X will track to less
than 0.001" full left to full right. The Y is dead on, and I still need to
do some tuning on the Z, but overall it is ready to cut.

My question is about the waveform shape setup, and the Phase A and Phase B
offsets. So far, I have been leaving them to whatever the factory defaults
were, or in the case of the offsets, what ever they were set to when I got
the drivers. Is there some tuning that I should do or should I follow the
"if it ain't broke don't fix it" rule?

Don