This mod adds in game explanations about efficiency/load calculations done by MKS.
It mostly shows intermediate steps, so that you can determine where this "843.52% load" is coming from (and how to improve it).
Known limitations:
it works by reverse engineering, rather than introspection, so it is prone to becoming incorrect when MKS changes (it seems correct at the time of writing this)
since it explains in-game vessels, it cannot be used for mission planning. My view