So, what's the problem with going to 35-40 offset?

[noobinacan]

generally speaking.
Low off-set = wheels stick out more
high off-set = wheels go in, towards the suspension more.

Our cars are happy between
+45 and +52 offset.

I use COBB's setup as a guide...it helps a little.

Volk RE30 18”x8.5”, +52mm offset Wheels (Street Class)
Toyo R1R 255/35-18 Tires (Street Class)

Prodrive GC05 18”x 8”, +46 mm offset (Mod Class)
Toyo R888 245/40-18 Tires (Mod Class)