CB1

Sorry if this has been posted previously. Got through about 30 pages and stopped cause my eyes were hurting.
I am looking to get new tires for my 2011 Sport Touring with the stock wheels.
Stock ride height currently but would like to install Swift springs (at some point). And I currently have no spacers.
I do have the FI TT kit on the car and was hoping to go wider in the back for more contact area.
Couple questions.
1) What is the widest tire that I can install on the front and rear without rubbing and ballooning?
2) I thought that I read that there is a rule of thumb on width differential from front to rear. What are the pros/cons for not following this rule of thumb?
3) Looking at the Michelin Pilot Super Sports at the moment from reviews and a little bit on the tread life. Are there better options of tires that last roughly 15K miles (for spirited driving, not tracking the car)?
I'm currently thinking these in the PSS. Front 255/40R19 Rear 295/35R19.?

Thanks for any assistance!

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2011 Metallic Black, Touring/Sport, Nav, AT
| F.I. Twin Turbo #060 | E85 | F.I. Built 7AT | F.I. Flex Plate | F.I. 34 Row Oil Cooler | F.I. 19 Row 7AT Cooler | ECUTEK Tuned By Sebastian | 647 WHP 605 TQ |