The pictures are a bit hard to see. First thing I see is that it looks like your machine is flexing quite a bit, as the cuts don't appear to be very straight? The solution to that is to take lighter cuts.
Next thing I'd suggest is to try different tooling. I'm thinking your bits aren't very sharp. Anything with veneer on it will not cut well with an upcut spiral, unless it is extremely sharp, as in never been used before sharp. Even cutting just mdf, if it's not really sharp, you'll get a fuzzy edge at best with some mdf. Cut quality can vary among different mfg's.
Switching to a downcut spiral should give you a clean edge. At 10,000 rpm, try about 2500-3000mm/min with the 6mm bits. No more than 14,000rpm.
For the smaller bits, use the same feedrates, but start at 14,000rpm.
Bottom line, though, it to use a downcut bit, and take lighter cuts if needed.
Some better pictures might help as well.