I have the mods that you are talking about, but sounds like mine sits a fair amount higher. In my F150 I am running a 2.5" leveling kit, air bags in the rear and 325/60/18s (roughly 34" tall and 13.5" wide). My truck sits dead level with no air in the bags but as soon as I put even a couple hundred lbs in the bed the rear squats, and since I think the truck rides too soft I always run around 15 psi in the bags when empty.
For the average 3 day weekend camping with my truck loaded with wood, games, bikes, ect I run 30 psi in the bags. I inflate them before hooking up to the camper and hooking up the WDH. Once hooked up to our 3220BH Passport my setup is close to level, the rear is down only about 1/2" from the front.
TT-2013 Passport 3220BH
TV-2004 F150 FX4, not exactly stock...
with 2001 Kodiak K215: 2010-10, 2011-12
with 2012 Grey Wolf 26BH: 2012-19, 2013-24, 2014-11, 2015-6
with 2013 Passport: 2015-13, 2016-15 booked