Hi @Jaap,
Whichever settings were working for you on the SainSmart CNC + associated tool, will work as is on the Shapeoko as a starting point (because the cutting edge of the tool does not care which machine moves it around ), but the difference will be that you will then be able to cut faster/deeper with the Shapeoko of course, and the precision will also likely be better.
There are many threads on the forum about cutting acrylic (tl;dr: use single flute cutters and feed fast), and a few on v-carving acrylic, here’s one where we discussed settings:
With a 1/8" 30° vbit you will need to dial down the depth and feedrate (again, what you were using with your previous CNC should be a safe starting point)