Best cutters for acrylic are single flute cutters or 2 flute at most. 4 flute cutters would need high feed rates but suffer from clearing the chips hence melting the cuts back together.

Can't remember what your machine looks like, so can't comment on the jumping/slipping/going off track probkems. Post a pic of it? Feed rates are subjective and dependant on your machine. I could tell you what I use for MDF but it wouldn't be much help as my machine is probably different from yours....

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