Since you haven't had your Mustang long, you might consider just taking it somewhere and running the hell out of it, stock. There is enough HP in it to do a lot. Get in a safe place and put it "on the edge", get some adreneline going and see what you think. I've done that and it has enough HP...
I have the same car as OP except for PP and there is zero vibration from slow to "very very fast". I have OEM Continenal tires and 3300ish miles. FWIW.
The spoiler isn't needed until the car reaches 249 mph. That's where my rear end started getting a little squirrely. Oh, for looks, yeah, why not.... :)
IF you have an automatic, you can pull the right paddle toward you and the gear will come on next to the position of the shifter display. That isn't exactly the best way but i do it now and then when I want to know while just putzing along.
Speed up the computer, get rid of the weird sounds on start up from the computer, get rid of the seatbelt reminder, get rid of the lights circling on the screen on start up. If they can't make a computer make the car better, get rid of it. I'll drive the car, all I need Ford to do is to make...
Financing is the "option" dealers most like to sell, perhaps the most. Selling a car just enables them to do that. It's the option, if it is one, that they make the most profit from. Most people do that due to emotion that probably took place along time ago......the lack discipline to do...
Of course there's climate change, tariffs, how long you've been with your carrier, and, let's not forget two things, that greed factor, and there is no climate change other than that which has taken place over millions of years that the insurance companies have to factor in. 👍
Tariffs don't frighten me either. I'm for them. If you own a Ford, you didn't buy all American. I merely quoted Ford for anyone that cared to know. I really don't care but some people do. Among those people are future car owners, especially the ones that can barely afford them anyway.
I've used leaf blowers to dry my cars for decades. Because I live on the side of a mountain, my neighbors can't see me wash cars. If they could, I don't care what they think.
Secondly, seat belts must be fastened before my car moves, no eating in my car, no drinking in my car and no stupid...