Still on the stock wheels and need some new tires, so I'm looking at getting a new set of 17" wheels and tires on my TT. I like Enkei RPF-1s for the price point/weight/quality.

Right now I'm zeroed in on keeping the stagger and just moving up .5 inch wider for 17x8 +35 offset (235 tires) in front, 17x9 +35 offset (255) in back. They also offer the 17x9 in +45, but I worry about the HICAS knuckle.

Will this setup fit without any fender rolling or hitting the brakes or HICAS? Also, should I just go 17x9 all around instead of keeping the stagger?

This car is for lively street driving/cruising on the weekend. I want to keep HICAS, and currently still have the stock brake calipers. The suspension is stock, but I am considering coilovers in the future or biting the bullet and replacing the OEM adjustable struts.

Done some searching, but didn't find this exact setup, so apologize if this info is already out here somewhere. Thanks!

I'd go for 17x9 35mm all around.

They will fit without any mods. You can fit up to 10" at the rear, anything wider (10.5") most likely will require mods.
I personally would keep a TT staggered, because of the handling at high speed.