I do the same with the slotting. I have VCarve and use ramping, but at some point no matter what you’re cutting unless it’s an outside profile with clearance it’s going to be slotting. The UI is pretty bad, and I’ve followed the directions about filling in left to right, top to bottom, but I can get some pretty strange results…yes, especially with smaller bits. With the feed over rides in CM4, plus my SuperPID for smooth router control I can usually “listen” and adjust if I have a good starting point. Maybe it’s because I use many of the same bits and I mostly cut wood, but my router speeds end up at 30,000 at least 1/2 of the time or 20628 probably another 1/3rd of the time and feeds can vary between “can’t feed slow enough” and 197ipm. Sometimes I feel like I’m just shaking up one of those Magic8 Balls and I get one of 8 answers at random. I will say though about 80% of the time the cuts “sound” close enough that I can tweak it a little, but I still kill material every so often, but haven’t broken a bit in awhile? Thanks for the info!