I can get 4 fingers in under the pommel, but will have to check when I get on, a large weight on the saddle does affect clearances...I remember now, I was riding Mr G in the thorowgood because I liked it, but then I saw how far down it settled when I was riding in it, it was back to my stubben straight away
The fit looks decent to me. We did not have any shots from the rear showing the gullet and the spine clearance side to side. From the front shoulder angle it is impossible to tell if the gullet is too narrow and the tree itself pushing onto the edges of the vertebrae "wings".
A longer girth will help it have less of a slope. I think the saddle needs to go back about a half to a quarter inch.
The angle of the seat is good; not too high or low in front.