I just watched a lunch and learn about tool files. The guy said if we are using a tongue and groove method for our dados, which we are, there is no way to ramp them. There is a global variable that allows for ramping with dados, but it does not work for our style of dados, only a full dado he said. I confirmed it after watching. I checked the global variable and the gcode is the same. We should be able to ramp tongue and groove dados too. You can ramp in x/y as you approach the Z value, doesn't need to be an arc, in our case, there is no room for an arc.