Main story line I have done nothing. All I have done so far is the minute men settlement quests and settlement building. With the Abernathy kidnappings and constantly needing to fight near by baddies for settlements (quests) from Preston, I have zero time for anything else and am forced to ignore some of these missions resulting in fails.

I have built tons of defense, but that doesn't seem to effect the frequency of the missions. Anyone else have this issue? Ways of getting around it?

Ignore them or finish 3 but don't turn them in and stay the hell away from Preston.

Also don't tune into that Minuteman radio and stay away from The Castle.

Yeah, I'd recommend you send Preston to The Castle and that way all the Minuteman stuff is confined and now controllable.

My main base is starlight, Preston is there, but it looks like I don't have the option to relocate him. I did disconnect the radio tower at the castle.