As far as "technique" goes, I have little to add other than I always packed, balanced adjusted, fit and wore my ruck as near to "perfect" as I could get it and that includes properly using the chest band, waist or hip band, and getting everything set and balanced as best as I could. Hell, I probably would have hooked up a head band "strap" (appropriately High Speed looking and in function of course) like some villager somewhere carrying "500 pounds" in a big straw basket with a rag around their forehead to the basket - if I had thought of it.
Other than that, yes you will end up "running", shuffling, jogging, walking with your ruck off and on for various distances if you are like most guys. That's the life of the Combat Arms Ground Pounder and yes - Special Operators must excel at Ground Pounding skills like bread and butter. Not everything is a glorious chopper ride in with an assault combat load, double tap the bad guy and one to the head, grab the intel and scoot. Much of it is routine training - over and over again. Tasks as mundane as picking up a monstrous ruck and pounding out the mileage with it. Or exiting an aircraft in flight with it and everything else including your weapons strapped to you - at night, and they put you off the DZ.
Become one with the giant wart. Learn to love the suck. IMO, 90% or better of everything in this game is mental. We just pick up our rucks and do it, cause that's what we do. Or used to do in the case of us Former Action Guys. It may sound flippant, but I think from an Infantryman to a Special Operations team, that's pretty much how much thought they put into it. Just pick the fucker up, groan softly in your misery if you must, and continue on with the many tasks ahead of you. You do it and make it happen because you are damn glad to be there and are doing things that few others have seen or done. There are not too many "strategies" other than maybe the tips given by some of the other walking hunch backs and broke-dicks around here that I can think of it other than perhaps using your gear as it was meant and to your best advantage.