X-carve speed limit?

Found an issue while ruffing, I’ve been doing some test cuts in low density foam (the cheap stuff from home depot/lowes) and the project starts off good on the first pass but steps off by almost a quarter inch on the second. It only seems to happen with a large stepover. Since I am using a 3/4 in spoilboard bit and foam I bumped up the setting as you can see below. Is it my machine or can it not run this fast without loosing steps? 1000mm machine with nema 23’s