New Tires & Rims - Measuring Fitment

First time measuring and learning about fitment, so bare with me.

I lowered the 5th gen XSE about 1.5 - 2". Current front specs show about 15mm of clearance from the fender to tire, 20mm from fender to rim, and 40mm from the strut to the tire. If I were to go with 19x8.5 with an offset of 38mm and 245/35R tires, I'd probably have to add neg camber, or drop an inch off the width, right?