First off, several of your comments lead me to ask what tire pressures you are running and have you considered a more AT style tire?
I'm in a nearly identical situation as you minus the J30 (would love one). I've been running the AEV 2.5" for roughly 50,000 miles and have really loved it...in a low to no added weight situation. In the last 5,000 miles I've recently started using the Jeep more for exploration and adventure...mild offroading. In full load-out I've got an ARB 50L fridge, Rhino Rack Pioneer Platform, drawer system, solar setup with Yeti 1000, Oztent RV5, along with various other items for camp setup. I'm pretty heavy aside from camp stuff, full skids, sliders, AEV rear tire carrier with 35"s, front steel bumper with winch. I've probably sagged a little over time (who hasn't) but I've never taken any true measurements. I've recently started working backwards with my suspension: swapped out the AEV tuned Bilsteins for Fox 2.0 Performance IFPs and added a Hellwig Heavy Duty Rear sway bar. I cannot recommend the Hellwig Sway Bar enough. My biggest complaint was the bobble-heading and swaying over rollers and off camber terrain. So far, it is a major improvement and one that I wish I'd done a very long time ago. So of the best money I've spent. Highly recommend the Hellwig!
I was recently told by a trusted shop that the AEV 2.5 springs weren't designed to carry all this additional weight we are adding to the JKUs. And I have to agree after years of use. In working backwards I plan to test the shock and sway bar change first...if I still need more stiffening I'm going to the OME 2.25 Heavys. Supposedly they'll net more than 3" and help my loaded rig ride smooth and level without much sway. We shall see. I'll be watching this thread.
Photo for reference: