I think, leave that background untouched. Its a very great neutral background, even if you would see that thing or not. The background as a "twister of lights" feels great, almost like if they are in some kind of dream (or nightmare).

And i dont really like the lightsabers to be too bright and colorful, those are getting too ROTS.

When tweaking things we think too much on where the light should be, or how something would really work phisically, without thinking if the colors match visualy, if it should be there, or if the tweak would be too distracting. (Thats one of the main flaws of the prequels special effects... ILM was too busy making them too real to realise they might not need to be).