Just looking at the pictures provided it appears to me that the saddle is sitting completely crooked on your horse's back. Either the saddle is crooked itself or your horse is a bit asymmetrical. In the case of the latter, this is easy enough to correct by using specific types of pads.
The gullet is definitely too narrow as there's far too much clearance in front. If you look at the level of the pins (buttons on the front of the pommel) in the second picture, they are completely uneven.
I'm assuming that these pictures were taken with the horse standing square on level ground? Also, a picture taken squarely from the side would be very helpful to see the balance of the saddle.
The panels also appear to be the incorrect shape for your horse's back.
It looks like you may have it too far forward. Make sure the tree points are about 2" behind the back edge of the shoulder blade. Put it on, girthed, no pad, and take a full side picture and 3/4 front angle showing the whole front of the saddle (flap and all) side of the shoulder (not a close up of the withers). Make sure the horse is tied with his head in a nuetral position. Head down changes the fit.