From the sounds of it, you may not be using Interact with Target and formations to spread out your toons.

Correct me if I'm wrong.

In PvE, Interact with target (IWT) is perfect for getting casters and melee properly lined up and in ranged.

I have a keybind for IWT, when I hold it down the toons move toward my target. When I release, they stop.

If they get to close, I can move my tank and use my formation key to spread them out. If I want to closer, I can have them follow real quick them break follow manually by hitting a movement key.

For formations, I use a foot pedal. I found that to be the most convenient and natural way to do it.
I can do star, line, and flying V quite easily.