I know you said you dont want to c-notch but wanted to show anyone reading this thread how low you can go with just basic bolt in bag plates,bags , and bolt in c-notch and lowering blocks....heres a video of mine with a basic bolt in bag plates up front and basic bolt in c-notch in the rear with the bags just bolted to the frame and trailing arms with the pre-cut plates,and no cups in the stock spring location and 2" lowering blocks...i did raise the whole bed wood floor and wheel wells up a 1 1/2" to allow the rear end to sit all the way into the c-notch without the rear-end pumpkin hitting the bottom of the bed wood, also flipped and repositioned the center driveline carrier bearing mount to correct driveline angle at ride height, and relocated rear shocks:
Click picture to view video( I have manual paddle valves so my air bags are really slow):
This stance is about how low you can go with stock front spindles and bolt in bag plates, and the bed wood raised with a basic c-notch and bolt in bags in the rear with 2" lowering blocks.....if you want to go lower you will have to start doing extreme modifacations to the rear frame and front lower control arms or drop spindles,pancaked crossmember, or porter built stuff..
LOL and after doing all the work to get the truck lowered on bags, I drive around most of the time like this....SKY HIGH!