I think you might be expecting results you maybe shouldn't expect in this situation. Bigger tires are not always better regardless of price.
For the worst weather, best traction and best mileage I have Conti DWS 235/50 ZR 18 on factory wheels. They sit in the garage most of the year unless the snowman cometh.
For show and and go I have the same brand Conti DWS60 in offset sizes currently installed. 255/45 ZR 18 front and 275/40ZR 18 on the back. (Makes me feel faster)
Its just my preference to run with the offsets.
In my situation, off-sets don't outperform the 235's even though they are the same tire brand, and I presume the same compound. I paid more for the off-set tire and even invested in wheels but I actually get better traction & performance with the less wide 235's on wet, and dry pavement as well as assorted road surface textures (bumpy, smooth, rough, etc).
Ever see State Troopers running 275s or offsets? Typical tire size on the Chargers are 225 for the V6 and 245 wide for the V8. Better handling and performance.
Discount, Expert, Tire Rack, Firestone outlets make our lives complicated.