I always use a baby pad/all purpose quilted square pad under my saddle. My saddle is pretty average sized (17.5, not a very forward flap), but I find a lot of the square pads to be kind of short in terms of length on the spine.
Part of this could be that my horse has a decent sized sloping withers so I make sure to pull up the front of the pad off his withers. I just find the back of my saddle or half pad hanging an inch or so over the back of a lot of these pads. The SmartPak diamond AP pads are too short, my Eskadron one is funky too. Drop length is no problem.
Has anyone run into this? Any suggestions?