Shuttle Problems

Can the devs look into issues with shuttle transport missions? I have 530 shuttles, yet no matter what I try, only 20-30 ever seem to work at the same time. The rest of my shuttles are given orders but sit idle and never execute them until one of the working shuttles is finished. I understand from the documentation that there is a limit of 20 shuttles per mission, but I have probably 20 missions active right now, so I'm not sure why so many shuttles are idle.

Same issue. I am over 200 and they seem to be sitting idle.

Any word from devs?

Bump.