I know what you mean by the high Ds. It makes a conventional breast collar work like a pulling collar. Give Kevin a call (Western Saddles, Trail Saddles, Barrel Saddle, Ranch Saddle) but look at the Elite series that he has - I think there is one exactly like the one you posted and he will work with you on price.
PD, when I got mine, I removed the rivets that were holding the plate on the end of the leathers and reversed it before putting it all back together. That way, all the excess would be to the inside of the bundle of leather. I don't know if you have the equipment to do that though.
My brother just cut off the excess from his just below where it went through the stirrup hobble. He can get away with that because his legs are really long. I didn't want to limit my saddle that much just in case someone with much longer legs needed to use it someday.
On all my old saddles, we used to just fold the extra back up and strap it in under the hobble leaving a little loop at the end like this (best pic I could find).