Booty Call Gantry Upgrade

[audiohustla]

Hi everyone,
I finally installed the bcj gantry upgrade and got it working, but I am not happy with the Set y_max_position in my printer.cfg, it should be 304, if I move my printhead with the buttons, I get 298 absolut, so with y_min -2, it should be 300. If I use that value in my printer cfg, I always run into Move out of range when I use some of the preset macros, if I use 304 it works fine. Can somebody enlighten me where this issue comes from? What esle do I need to change?