I use regular pads with the seam; the gullet doesn't touch the seam. Pads don't seem to be shifting at all either. I really want to get a limpet though, the big horse is 2" uphill, but being broad and big shoulders most saddles slide too far back on him.
There were a few I figured "fit", as in didn't need a rear lift of 3", but my spur would be literally at his flank. And the tree would rock or bridge, you name it. Not kool on a youngster.
I like this Ansur, it stays put ok, but every centimeter forward I can get I will take. Thats why (me thinks) I lean forward a little- this horse is coming thru some sore back downtime, and instinctively I get off his back. Or is it cuz I ride too many 3yo! Anyhow I pop a little and swear to sit better next time

. The balance of the Excel feels *right on* on other normal horses.
Oh I do remember the meaty thigh feeling- no seat, no sit. I taught someone who had a perpetual TB spooker- and when I used my saddles, (narrower twist) he couldn't "unsit' me, and no more gawking.
I ride so many youngsters that seat security is #1 for me- and not cuz of big thigh rolls- I mean it- sitting well. I had 3 babies take their first canters last week- very calm and easy!