the design shows no mechanical leverage on the hydraulic units so it`s just about linear in what the pushrod is delivering in stroke...So :any bubble any Give in the hydraulics will have a HUGE impact on the system as you have a linear but also VERY short stroke damper or ARB ,heave damper or what you happen do do with those hydraulic units.
They seem to have got on top of the system but I´m sure it was a taking them hydraulics experts a fair bitt of head scratching to get it working perfectly over and over again...
Why not designing the rockers to carry more mechanical advantage ? Admittedly it looks very nice..but you don´t need to make things harder for you than necessary..