These days I don't build lone arcs anymore. I only send them out in groups of 2-3 so my new planets get a bit of a kickstart.
Same, I'm thinking of only sending them in groups of 3+, probably 5 at a time. Anything other than that is fairly useless as the planet doesn't produce much for weeks.
Me and uranus have a mutual non-aggression pact.
I just wanted to say that.
Important to note so that we know you're safe