I had a Cobb AP v1 and found the economy map to be ... stupid. The vertical pedal on the right is much better at economizing.
Assume you are running an economy map - there will be instances where you temporarily will want / need full boost (merging and such). If you are stuck in economy mode that will not be an option ... this could be a safety issue depending on the circumstances.
I'm on 17" x 8" rims with 225/45/17 tires and they are plenty grippy. I think people put too much emphasis on bigger is better when it comes to tires and rims.
Lighter wheels and tires will not only perform better but will use less fuel then their 18" 245-ish tires. Less rotational mass is better than stance or looks.