Got the new saddle on him and evaluated the fit compared to the western, with no padding, just the saddle straight on his back.
Off the withers- always a good thing.
Not pinching around his shoulders- he's gonna be able to reach further out with his front legs and hopefully won't protest carrying me up a hill as much anymore.
Laying on his back the whole way, not rising up in the back- unlike the western saddle, which somehow managed to sit far off his back under the cantle.
Only problem? Girth too short. D: Bought an extender on Dover Saddlery, should be in in the next week or so, then I can evaluate the fit while riding.