Nate is right, you should keep the speed down until it's all assembled and ready. I can neither confirm nor deny that I ran my gantry off the table by being a little over zealous with a partially assembled machine.
What are your settings in the motor tuning window? There is an acceleration setting there that I think comes into play here.
Also, homing speed will vary based on the distance it needs to travel (and your Z axis will always be slow). If it needs to travel a short distance, it will jog slower than if it has to cross the entire table. But your XY speeds look way too slow, even for a short jog.
I've had my R4512 for almost 2 years now, it's a good saw. Last time I checked, Ridgid wasn't making zero-clearance inserts for it, I ended up buying the Leecraft versions from Woodcraft. That fence looks different than what shipped with mine. But I never installed my Ridgid fence, I went straight to an Incra. It's still sitting in a box, waiting for someone on eBay to want it.