Most manufacturer’s speeds and feeds charts aren’t appropriate for hobbyist CNC routers. So, the chiploads and feed-rates they recommend are generally way to high.
What bit is it? How would you use it in a handheld or table mounted router?
Personally, I’d max out the router speed for the bit and feed at a comfortable rate (generally starting far less than 100 IPM). I wouldn’t worry about making “dust” rather than “chips”. As you know, higher router speeds and lower feed-rates/chiploads usually provide the best results and reduce operator/CNC machine force requirements. I wouldn’t expect the Shapeoko to do much less or more than I would. So, think “how would I do it by hand?” - then back-off as much as you need to feel comfortable for the Shapeoko to start. Carbide motion makes it easy to increase and decrease your feed rates while cutting and a 100% increase in feed rate should be roughly equivalent to doubling the depth (or width) of cut.
This is just my opinion, so you should also consider the advise given here.