Yes, that is what I would purchase, if I understand your problem. These pads are also great for those "older kid sway back horses."
Here is another link,
it has a "zoom" so you can see what it will look like. Mustang Herculon Cutback Built-Up Saddle Pad - Horse.com
I always recommend purchasing a saddle with a wide gullet. (7.5-8 inch) With a wide gullet you can change saddle pads as you ride different horses to adjust the fit. A narrow gullet,(6) you are S.O.L
. if you ride a "bulldog built horse."
Being raised on a working ranch, cowboy hired hands just had 1 saddle, but they always have lots of different saddle blankets to make that saddle work. TB withers
, use a built up, cut a way, Mutton withers
, use a thin blanket.
If you have a lot of $ to buy different saddles to custom fit each of your horse(s) great.
But my working saddle is like my favorite pair of boots! I hate to "break-in" a new pair!
Hope this helps...