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Im now testing an LDO NEMA 17 motor OverTheMoon LDO-42STH25-1004AC which is a High Temp High Speed pancake motor.

And I think I found the real root cause, aside from not-ideal stepper choices, I was using a Jerk speed of 200 mm/min, which is a value I found online as a recommended "extreme" setting. The default value is 40mm/min. When I dropped this down to 100mm/min and combined with the new light and fast stepper I can now achieve a pretty impressive 400ma current on the Stepper driving the Nimble (and still at high speeds).

As per the wiki
https://duet3d.dozuki.com/Wiki/Pressure_advance

For setting multiple Drive pressure advance, the command suggested above doesnt seem to work, ie:

“ M572 D0:1 S0.3:0.1 “

then if you send a M572 and you get

" M572

Extruder pressure advance: 0.300, 0.300, 0.000, 0.000 "

Instead of D1 having "0.1" it appears to just keep the D0 setting?

Firmware Version: 2.05.1 (2020-02-09b1)

@droftarts

Alright, an update and progress. I tried two smaller half height Nema17 steppers from my junk box. I also isolated a piece of movement from the actual print Gcode and made it into a macro. This was the most "offending" section, the last two fast extrusions back to back.

Macro:
G0 F2500
G1 X39.245 Y28.111 E12.53808
G1 X38.845 Y30.238 E.65933
G1 X11.598 Y57.486 E11.7389
G1 X39.245 Y28.111 E12.53808

This piece of GCode causes stalls on both the full size, high torque Stepper motors (the Wantai and the StepperOnline), Ie both fail, no matter the current (amps).

Conversely both the smaller Steppers could complete it with the following settings:

Working with 17HS3001-C5X (without gearbox, so its now a low torque direct motor)
M906 X1250 Y1250 Z1250 E1615 I25

Working with unnamed (it literally only has "XY" written on it) half height stepper
M906 X1250 Y1250 Z1250 E1545 I25

So basically the cheap ass, no name small Stepper works the best in this scenario. Im going to look for a better option online, annoyingly not mentioned in the Zesty Manuals but is on their old product page is a specific recommendation: https://www.omc-stepperonline.com/nema-17-bipolar-1-8deg-16ncm-22-6oz-in-1a-3-7v-42x42x20mm-4-wires-17hs08-1004s