It's always a compromise, More caster also means more weight jacking but with macpherson strut suspension you also get more camber gain. For the Mustang the camber gain outweighs the weight jacking imo
A good rule is that different manufacturer pads will not be compatible in the scenario described.
Some simple green and scotch-brite type pad should be good to clean the rotors. Is this totally necessary? Maybe not in this case but is still probably a good idea. Cleaning will optimize the brake...
What are you planning on covering and what is your experience with ppf?
Minimal experience; bulk rocker panel/flat surface install would be fine. Hoods, bumpers or any large panels would not be suggested. Do you plan on cutting film on the panel or wrapping edges? Both are tricky. Even wrapping...
West Coast Wheel(LMR sells these) has sets with each lug nut being a splined lock. They offer both standard length and 2" which can work with extended studs(depends on stud length of course). The 2" works for my setup.
Box end to break it loose, ratcheting wrench to remove. I was able to get 1 hand on the side of the transmission and the other from around the driveshaft. No issues completely removing the bolt or with the install.
Suspension upgrades are subjective to a point so you'll get lots of answers and opinions. It's also a black hole for upgrades. Tons of good threads here so suggest searching for a bit too. Here's my input:
Ford Racing track dampers, BMR handling springs - not a fan of progressive springs but...
Most people use 32mm for the rear. It works but an 1-1/4 is a much better fit.
Most people use 36mm for the front. It works but a 35mm is a much better fit.
A deep socket is your best bet. Some shallow will work but it depends on the brand.
Although not a direct answer to your question;
These look to be vacuum formed out of ABS which is most likely what most of these types of products will be. Depending on how bad the corners stick up either heating the part to fit better or using an adhesive promoter can solve fitment issues.
I've ordered from them over the years for several different vehicles; suspension and brake parts. Have always had a good experience and would/will buy from them again.
When the rear wheel bearing assemblies were replaced was the most recently updated nut used?
There are several threads discussing the torque for the nut as well. May want to re-check the torque on the nut. What you are describing can be caused by loose rear hubs.