It sounds as if your saddle may not longer fit. I would guess that the saddle is too wide because generally, when a saddle is too narrow, the saddle pad will be pinched.
Six years is also a pretty long span of time and certainly enough time for a horse's back to change. So, although the saddle may have fit years ago, it is very possible the saddle no longer fits.
Fortunately, most Wintecs come with an interchangeable gullet/tree. Does your saddle have the ability to change the tree size? If so, I would suggest making the tree narrower.