I was going to say, but Saddlebag beat me to it, that it doesn't look pommel high, or if so, hardly any. The angle of the bars at the shoulder looks good, it seems to fit the somewhat swayed, maybe dropped back is a better word, though the very back of the saddle seems to come off the back a bit. you say there is neither bridging or too much rocker? I honestly think the fit isn't all that bad, and if you have to use a thin wedge , then do so.
Sometimes that feeling of being constantly riding uphill (when the pommel is too high in front) can diminish as the horse starts pushing more from behind and lift the back, with more fitness.