to the OP - let me ask it this way. You have a nice pair of boots that fit you great w/a regular pair of socks on. So, you decide to go on a long hike w/those boots, & since you want to be comfortable, you put on very heavy socks to give you "padding/cushion", right? WRONG. You surely would not put extra pads or thicker pads on your horse - that would be the same theory. You would be miserable w/those thick socks in short order & it's the same for the horse w/the double pads or extra thick ones. First - you need a saddle that FITS THE HORSE. No pad in the world is going to make a poorly fitting saddle "fit". Then you get the thickness of pad that compliments that fit - simple as that. If your saddles are too tight for that big boy, you need a bigger saddle, probably a draft size tree. If you go w/a quality pad that is not going to squish all down, then you have that compression/concussion rating & protection, no matter who is riding the horse, where you are riding or for how long.