I think its to far back by a few inches...just a few.
Don't care what the panels are made from....
I would like to offer a tidbit of comfort for you to do when saddling....your horse
will appreciate it.
Take your saddle pad and pull it into the gullet of the saddle so when you girth-up so you not strangle the wither and top of the shoulder in movement...
Your saddle pad is edge bound and that will apply pressure and cut into the wither area rich with nerves...
This picture below is a bit of "over-kill" but the idea is now understood what I refer to..
View attachment 1131125
It is hard to evaluate saddle fit when a saddle pad is used and not pictures taken to show fit are given. Get rid of the pad...
You need to stand opposite to the horse. Then pictures from near the shoulder taken so we can see down the underside of the saddle, down the gullet from both sides...
Then picture from the back looking forward from the tail so the gullet channel again is seen.
More views need taken and shown for a good evaluation to be done, a fair comment good or bad given.
Make sure the horse is standing square not resting a hoof and is straight so tail to ears is as straight a line as possible.
I'm honestly not sure this saddle is what you need, and yes, the wither is very close to being slammed when the rider gets astride to me is not a good fit...and you have a slight cut-back head....does not bode well for the saddle currently as it is seen.
I have a sneaking suspicion when a riders weight gets astride the saddle is going to collapse down on the wither...
I sure hope I'm wrong, but.................
With all that said, your saddle fit is compromised because the horse is thin.....yes, he
is underweight.
His shoulder points are seen, his wither is very prominent which means where he should have fat pads either side of his saddle he does not, and where his shoulder blends to his neck is angular and bony tells me he needs weight and once he gains that needed weight the saddle you work to fit today...
will not fit him.
Beware your journey is just starting on getting a saddle this horse will excel in having as his...
🐴.....
jmo...