Split people your playing against into number of item stars; Therefore people with 0-4* in total play in one group, 4-8* in another, so on and so forth.
Im a T3 newb, and I get my own self handed to me from the T3 5* people who all have DAs and stuff. I'd rather play with fellow 4* people. Atop of this, to stop players who have extreme imbalances in load-outs (e.g. one 5* item and the rest 0*), should get a nerf against that item, but still entered into the 4-8* group.
People who have additional weapons added should get an average of the weapons stars which is then doubled. This means that someone with 4 weapons will have the total of their weapon stars calculated into one weapon, then this is doubled up so that the star count is not skewiffed.
yes this will require a lot of behind the scene sums and checks, but, IMO this will make for a fairer way of removing the lesser players from the FSC solo'rs