Hedge,
You will not get much, if any lift out of a set of Stable Loads.
If you have upper secondaries, I would attach them between the main pack and the secondaries. Your loaded rig will just not get as much droop with Stable Loads since the secondaries come into play sooner.
Attaching the little stops between the lower overload spring and the main pack accomplishes the same lack of droop, but at the expense of spring travel. Plus, it's a bit stiffer ride when you bring the overloads into play right away. The overload spring is not made to flex very much, if any so the ride in that arrangement does suffer.
jefe