steptest relies on stepgen to do acceleration limiting.
so this line
>         position_cmd = position_fb + 2 * maxvel * fperiod;
puts the new goal out in front of position_fb by twice the distance
stepgen could cover in one period at full velocity.

steptest maxaccel should probably just be removed.

I don't know that steptest should be used for testing servo systems.
but at a minimum you'd have to add a limit3 block to provide the
acceleration constraint that stepgen provides internally.

Jeff

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