Less backspace may help, this would put the centerline of your wheel further to the outside, so it will hopefully clear the swaybar when turning.
Another option is wheel spacers, which also accomplish this, but I have heard mixed reviews on wheel spacers for offroad applications. Definitely do not go with the cheapest brand you can find if you use them.
as far as 15x8 or 15x10, x8 would give more clearance.
Also narrower tires is an option.
Maybe a less agressive tread pattern that has less tread over the sidewall.
any of these will bring the tire farther away from your swaybar. How many inches do you think you need to let your tires turn all the way?