Helderberg

Was trying to find a video or exploded view of the brake piston engagement with the brake lever on the new 7020 Shimano. It has a considerable amount of slack before the brake is actuated and it has no adjustment to compensate for it like the older model has. I am trying to see if there is a way to shim the piston to lever area so as to reduce the free play if that would even be possible. I have already bled the system and the next idea would be to possibly find a thicker set of pads that would push the pistons further back and remove the slack in that manner. Please to not jump all over me as I am not at all familiar with the internals of the unit and if I am way off base that is all I need to know.
Thanks in advance, Frank.