Ray, if you make changes the volumes, you may have excessive travel. For example, if you have a cylinder 1 inch and a slave 1 inch ( diameters ). if you push in on the cylinder and it travels 1 inch, the slave will go 1 inch ( volume to volume ). Now, if you change the slave to 2X the volume, it will only go 1/2 inch for the same volume from the cylinder you pressed 1 inch.
I hope this helps!
