Appropriate wheel back spacing

Hey all first time posting her so go easy on me. After doing extensive research, mainly from this site i proceeded to lift my vehicle. I have the toyotec lift set to 3.5 inches in the front and running 285/70/17 bfg at's. I am running pro comp rims with 17x9 and 4.75 inches of back spacing and the tires rub lightly. I was wondering if adding wheel spaces to reduce the back spacing would help with rubbing. The next picture are the exact rims i am running.

 

Where exactly are you rubbing at?

 

Rubbing on the inside and outside edge of the tire against where the mudflap would be. Ill take a couple pictures tomorrow when it is light out.

 

I would just find out where your rubbing on the fender and cut it. I have scs with 4.3 back spacing and had to trim inner fender up about 9 inches to stop from rubbing. Beats spending another 100 on spacers.

 

Assuming that your mud flaps are already removed, you can add more caster to your alignment to help avoid rubbing in that area if it's minor.

Adding spacers, will only make the rubbing worst. Kicking the wheels out will create a wider turning radius.