Re: Different max PSI tires
___I would place your tires front to rear a lot closer than 10 as that is a bit much. The one good thing the door placard is for is to see if there is an offset. If there is a 2# higher pressure recommended for the fronts, why not consider 44 for the fronts and 42 for the rears. That is just my own advice as to where you can start from.
___for N2, I hope you didn’t pay for it because it is not doing anything for you. It can even hurt your FE as it does not expand (pressurize) at the same rate as air will and thus costs you a few ounces of fuel once warmed up.
___Save the WAI (Warm Air Intake) for later once you have the basics down and it becomes cold again later this fall. Installing one now would be/could be detrimental to both your performance and FE!