The reason I ask is because shoeing can often exacerbate problems, one problem being the friction the shoe creates with the heels, which can often cause the heels to wear unevenly or perpetuate underrun heels. The shoeing I think is good. The shoeing is compensating for the lack of idea angles with the hoof. Apologies if I’m repeating things you already know.
The angle of the hoof wall and the angle of the heel should be roughly perpendicular. When you have a heel angle that is significantly less than the angle of the hoof wall, you have underrun heels. Above shows the angles of the hoof versus where they should actually be.
The cannon bone really needs to be vertical to get a correct assessment of angles but for the sake of conversation I’ve drawn them in. The red lines indicate the angles of the shoe - the farrier has backed up the shoe which brings the break over of the toe back and the heel back slightly. The yellow angles indicate the angles of the actual hoof. While the shoeing is working in the horse’s favor, it doesn’t magically erase all problems. I agree with you that the LH is much better than the RH. The heel of the shoe is falling where it should, a vertical line can be drawn to assess where that should fall:
When trimming the heel, the heel should be brought back to the widest point of the frog which would be the green line:
You can take a look at the bottom of the horse’s feet and see where the shoe has been placed and the heel has been trimmed to get a better idea.
A good way to assess palmar angle in the hind feet is to draw a line matching the angle of the coronary band and seeing where it points in relation to the knee. An angle that falls above the knee is a good indicator of NPA. The angle should point directly to the knee:
The really crappy thing about horses and shoeing is that some horses do better barefoot than they ever could shod, others will never perform as well as they would without some type of shoe. You could potentially remove shoes and get improvement all around. Shoes are not without problems and underrun heels and contraction are common with them. Shoes can help correct angles but often the effects of the underrun heel (etc) are still there. You may have an excellent farrier but the way the foot wears with the shoe may constantly work against you.