i figured you would say 645. its a great servo but is NOT designed for heavy duty steering. i might use it on a stadium truck or car but certainly not an MT. The bare minimum IMO is 200oz of torque for an MT. I generally set my servo saver by hand. I am running a JR 8711 on my esavage so i keep it a little tighter than most. hold the servo arm still by hand and then turn the wheels with your other hand. that will tell you how much force it is going to take to compress the spring and give instead of snapping your servo.
you can just adjust it based on that.
EPA is end point adjustment. most aftermarket radios have it. it is nothing more than a "range" setting. sometimes the servo turning radius is actually more than your available turning radius. simply put, at XX%, your steering is maxed out and your servo is trying to go further. this means each time you turn the wheel all the way, the servo is pushing against solid resistance. you lower the epa number until the servo stops right before your wheels won''t turn anymore.