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Your best bet is the widest 18 you can go if you want to stick with 18s, which is 8.75 without worrying about offset on a 9 inch. Lowest offset you can go without rubbing is around +30 on an 8.75, XXR comes in weird offsets (mine is +33 :s). You can stretch the tire, or get thinner tires to go lower or both. If I were to lower mine more I'd definitely need around a 215 ish tire. i'm sure others will chime in on their setups, there are definitely some really clean slammed Fortes with excellent wheel setups here!
If you do like a 215 on an 8.75 rim you'd be able to slam it pretty hard I think

here's a 225 on an 8.75.