I have a barge. I am sad because only 5 ships can dock on it. It's perfectly fine in any other aspect, perhaps but the size problem that gets it bumped like hell and also caused me to spin kill a few times fighters that undocked from it.
IMO reducing the size to one of a big battleship wuldnt harm the game play for two reasons -
1) it's still big as hell.
2) it still can't do much, besides mobile base.
And while we are at it, any option to give barge some ability to build some modules on it? Etc