Sandy, i know that u don't like this shield :D, so i've search myself why i've got problem with it... And found something to solve my problem : i've changed stepType from mircrostep to INTERLEAVE (in configuration.ino), and now all is ok 🙂

any reason to use microstep with adafruit v2?

It's one of the reasons I wasn't keen on this shield was that I didn't really understand it!
I think my reasoning for using MICROSTEP was that the other settings moved quite jerkily - it's the same kind of behaviour as when the old motorshield was overpowered. And sure enough, when I turned the power down, the jerkiness got better. I think I felt that microstepping would work more reliably, without having to do the power supply tuning, because that's quite difficult.

In common with all microstepping drivers, you should define your machine size in full steps (ie motorStepsPerRev=200), and the use stepMultiplier=16.

The purpose of that is to prevent the motor from ever stopping on a microstep position - that's not really possible to do, and it heats up and gets angry if you try.

Interleaved style, you should double your motorStepsPerRev (ie 400), and have stepMultiplier=1.

sn

I've just achieved success with my motorshield V2 changing from microstep to
const int stepType = INTERLEAVE
steps per rev to 400
multiplier to 1
Then after readjusting all page size and location values I'm back in business with both drawing and pen lift moves maybe 10x faster than with microstepping.

Running a D2S job now and it is simply zipping along. About 1000 lines per hour, which is many, many times faster than the default setting.