I’ve got plenty of room on front bottom lip with it bent 3” back.
If I can run 18x9.5 with 5.25” backspacing on front…. Then I’d try 18x10.5 with 6.25” backspacing. So same front side depth, just wider rim… and wider tire.
What’s available in 295/35/18 to 305/35/18 ??
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I don't see why not! I don't think I could run your current set up even with my fenders rolled and pushed as they are and I have plenty of room for 275's.
Unfortunately the 295/35/18 field seems to be narrowing a bit, but there's still RE050A's, Pilot Super Sports, F1's, Advan A052's, Invo's, Proxes and Extreme Contact Sports, so you've got street options from 140 to 300 treadwear still.
305/35/18's only have a couple of race only tires like the R888R, but they're only 100 for treadwear. They'd also be 26.4" tall, which I think would cause even your car issues. I know on mine, lowered as I am and running the qa1 LCA's I only have a smidge over 13" from center of spindle to the low spot on my inner fender, so 26" tall up front is about as high as I can go unless I want contact before I run out of compression travel.
Plenty of caliper clearance, probably about 3/8" before any contact. When I ordered I was asked about the clearance, the 17's and cast 18" have about 1.45" max clearance so those might not work but the custom 2 piece ones have 1.75" of clearance.
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Nice! So, if I want ET's with my new Viper kit they'll probably have to be the 2 piece kind up front...