Hey, thanks for your input!+32 you'll have some pretty big poke if you're into that look. Also with 19's and 245/40 I can guarantee you'll rub if those CS springs are even lower than the eibach ones I use. I already do with winters at 225 50 17 +38. Also it's not just offset you need to look at but also the rim design. Even with +35's the konig's wouldn't clear my bbk. Mind you I was looking for 17'' rims specifically.
I definitely don't want the wheels sticking beyond the body; I'm looking for what it may look like if Mazda did OEM 19in wheels with good brakes. I was basing my configuration on this video, where the Konig 18x8 +35 wheels and 215/45R18 tires easily cleared the Corksport BBK. I figured by dropping the sidewall ratio to 40, the 245/40R19 would be (pretty much) comparable to 215/45R18, in terms of diameter.
There's also this, which is the wheel I want installed on a CX-30 (but with 20x8.5 +38 wheels) and 225/40R20 tires.
I figured rubbing wouldn't be such a concern since the "NotSoLow" kit isn't an aggressive drop. The eibach drop is 1.5 front and 2.0 rear, while the Corksport is 1.0 front and 1.6 rear. I don't mind omitting the lowering springs if that prevents the tires from rubbing.
So the safest bet would be to use 19x8 +40 / 245 40R19 (+spacers if needed) and to skip the lowering kit?