I'm assuming you're not using Cut3D for this? Might be better to post in the VCarve, Aspire or Cut2D section (depending which software you have) to get more responses.
Look up the chip loading for the material/bit combination (https://www.cutter-shop.com/information ... chart.html
for example) and tweak from there. With the spiral bits it's pretty easy to tell if you're running too high on the RPM's or feeding too slowly as they will squeal like crazy.
The burn on the ramp will probably be from the feed rate being too slow as it contains Z movement.