New tire setup isssue
 

So I am planning on swapping back onto my mpss tires. Here's the issue(s). As of right now, one of the tires is punctured so I am planning on running mpss tires in the front and purchasing a new set of potenza re71r for the rears.

I have a few questions/concerns.

1. The mpss tires that I will be running in the front have uneven tread. It's not too serious but I was wondering if it would be best to flip the tires on the rim?

2. My front's are mpss 245/35/r18 and I was planning on getting re71r 265/35/r18 for the rears. Would this setup be optimal or should I get the same spec tires?

3. I am currently running xxr527 18x8.75 all around. Would the re71r's im looking to put on fit?

4. Based on tire specs I was assuming the mpss would be best up front and the potenza's in the rear. Any advice on this?

Sorry I know I'm literally asking to be spoon fed but I've been extremely busy with personal issues and haven't had much time to do my due diligence.

Sounds less than optimal, imo. Running staggered tires, then using a 300 treadwear tire in front with a 200 treadwear tire in rear just sounds like a recipe for understeer. Not sure what other mods you have, but I'd say it's really not necessary to have that much rear tire unless you have forced induction. Also, the nominal wheel width for a 265/35/18 is 9.5", meaning it will be pinched down a bit on an 8.75". I'd just run matching 245's all around, nothing wrong with Super Sports or PS4S for street use.

Well, if I was in that pickle:
I'll make sure the rear tires match. Both in brand and thread ware.

If the punctered tire is fixable and is even thread as the other. Do that. Till you replace them with new ones.

There would be some understeer but wouldn't go balls to the wall, till you know how bad it is.

As said before, 265 is heavy ass tire for sub 200hp car but it's your car. Best of luck.

Most has already been said. Go for same type of tires all around, it will not increase understeer above that of already understeer biased stock alignment, and will also allow to rotate tires front to rear to even out wear and get more out of set and simplify changing all tires at same time. My friend, whose car has stock staggered sizing says it's PITA. Our cars luckily have square tire sizing, see no reasons to willingly introduce handling issues/complify replacement/reducing how much you can get out of set/loosing ability to rotate/reducing tire choice .. by paying own money for that.
Only advise on top of that would be to never use foam tire repair kit some twins come with, only spacesaver tire, as after that kit usage most tire shops will refuse to repair tire, so you loose cheap repair option and possibly may need to buy pair of tires, if wear level differs by much. And again, yet another con for if staggered tire choice, as spacesaver cannot be used on rear axle (due it having LSD diff), so in case of punctured rear you cannot simply relocate one of front tires (normally of same size/type) to rear and spacesaver in front, you have to do double the work to put both fronts on rear for them to match in rear.
In short, don't go staggered. There are only cons, handling problems, inconveniences and extra spendings, with only "gain" fooling ofself by false misconception that if it's staggered like in some supercars (forgetting, that they/their suspension/brakes and alike, have been designed around staggered) then it's "better". Each car is designed as a system. Putting F1 wing on dumpster track won't net you anything (though silliness of example aside, at least only con will be misspent money, unlike with staggered tire choice).

I would add two things. That little contact patch of the tire is the only thing keeping you on the road. Is this where you want to try to cheap out or do unusual things? Get good tires, it’s as simple as that. Also, the lighter tire/wheels/brakes/rotors are, the better.

265/35-18 is not a good fit on 18x8.75. 245/35-18 is the "right" size.
RE71R have a lot more grip and much stiffer sidewalls than MPSS. Also in my experience MPSS lost all grip due to age by the time they were halfway to the treadwear indicators.
Just get 4x RE71R... Or get 4x Hankook R4S for similar fun with a little less grip but much longer life.

You can probably get a few $$$ for the used MPSS.

How much tread is left on the MPSS? Where was the puncture? How big was the puncture? Did you drive on tire while it was flat?

If the tire is still good, you have sufficient tread, and the puncture is not too close to the sidewalls, any tire shop can professionally patch it for you for around $20. Some places even patch it free