After re-reading your message
Quote "The finishing cutting (800mm/min, 1.5mm pass depth and 9% stepover, cutting along the Y-Axis) seemed to leave some ridges"

Sorry, for not looking at this in the first place, but after doing some math, using a 1.5mm deep x 9% stepover of a 10mm cutter is much too coarse for a fine finish,

I primarily work in inches, and for a smooth finish in wood, you need anywhere from about .002"to .010" inch stepover in all directions
Which would translate in metric to about 0.05mm to 0.20mm (if my math is correct)

It going to take longer to cut but you should see a much improved looking part