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Definitely check for, and remove, any capacitors.

Also, try changing the settings

CV5 - 50
CV6 - 28

These will lower the top speed and give a shallower acceleration curve at the lower end.

After that you could add inertia settings to CVs 3 and 4 as these will smooth over any steps in the control. As an aside, I prefer to run all but one of my locomotives on 28 steps but with fairly high settings in CVs 3 and 4. Only that one odd one works much better on 128 steps.

It may take a while experimenting with the settings until you are happy - leave CV3 and CV4 set at 0 until you are happy with the top speed and speed steps, then try altering them.
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