Your kind of answering your own questions really. Sounds like you understand the basics as far as the coils and spacers.
As far as the Mopar 2in lift. I sell them and install them. You should not change anything. It was engineered the way it is for a reason, so it will not void your warranty with Chrysler. The 2in Jeep Performance Parts lift raises the front end 4in and the rear 2in. It was made to sit level with a bumper and winch.
If you feel you want High steer the best thing would be the AEV Highsteer kit. I doubt a dealer would even notice it, they look very OEM.
My advice is to figure out what kind of wheeling your going to do and make a plan. Mud, Rocks, Overlanding, Mostly street, Baja, or etc...
Heres a couple we did at the shop with the same lift you have. I rides like stock, for 95% of people its perfect to run 35in and stock flares or 37in with flat flares.
Stock with 2in Jeep lift only. This jeep has been all over the country wheeling hard in stock form before the lift. Check out the gnarly rock rash. Your much better off investing in a good skid plate like this RockHard version, over spacers or different springs.
This is RhinoLiner on the entire JK and 10A hood and Genright fenders and 35in rubber. This Jeep owner isn't as hard offroad but he has a RIPP supercharger to make it more interesting on the street...