I think the 38 offset is a little to low, I prefer the wheels completely under the car, but that’s just my opinion. It is definitely not to high of an offset. Your savior is running baby tires.

Car looks great! Can’t say I agree that 255 isn’t enough tire, especially those sticky tires you have. It’s not like your stretching a 215 on. Sure a 275 will have a bigger contact patch but unless you’re tracking the car often or drag racing I don’t think your gonna see much of a benefit, plus your just adding unsprung weight. Rock what ya got, the difference is going to be minimal if you really sat down and directly compared the two.

I have not tried 275/35, and only my tears are rolled from a previous setup. I used to run 245/35 with a 19x9.5+35 in front/275/30 with 19x10.5+35 in rear. It rubbed all over(at the height I wanted) and I’m happier with this setup. I went with a 255/40 to both save some weight and keep a comfier sidewall, albeit the % may be around the same. I think OP’s setup will work great if he plans on lowering it. His suspension is firmer and should allow him to go easily lower than mine with no rubbing issues and be further under the car than mine. Also, interestingly enough I’ve read quite a few articles lately where wider tires don’t always equal better laptimes. but either way I think 255 is plenty for the front and is already an upgrade from stock. Personally of the 45k I’ve put on mine only 5 miles or so have been on actual tracks.

I run a 275 square setup. I drag race and have traction issues. If I had 255s I probably would be slower than my is350 with the same tires. I need 275 drag radials before I can preload the car (brake boost).