I'm impressed with Ford engineers' ability to adapt the upper secondaries to modern use. Alex concocted this set up to haul his Lance 815 camper on his 2007, F-250: note the homemade block:

Here's my 2001 Dodge 2500 set up with 3 upper secondaries, and one helper spring in the main pack. You don't see the upper Stable Loads. This is the spring tension without the camper on.

As always, try it out as is and then assess whether you need more secondary capacity. If the pic above is your dry set up, without all your camping or traveling goods, chances are you will need more help. Just looking at the set up tells me you could use one more stock, upper secondary leaf. These do not come into play until you have a load. You will still have some suspension travel. The actual thick lower overload spring has virtually no flex and is just the last resort for your suspension to bottom out on without hyper extending the leaves. Anytime you 'fix' your overload spring to the rest of the pack (like with a lower StableLoad) you doom yourself to a very minimum of flex and a stiff ride. If you find you get too much sway, add a thicker anti sway bar but know that it's a two edged sword.
It's still nice to see a brand spanking new truck suspension with shiny black paint reflecting back some great trips to come.
jefe