I'm dumb. I couldn't figure out what was wrong with the new poses. I've been looking at them with a human volume instead of a pony volume. Sigh.
Edit: To clarify, humans and pones curve and bend in different ways. Instead of an hour glass, they're much more like a rounded tear drop. Limbs also fill out differently. More of a straight up tube than joints and muscle. I essentially added to much actual anatomy to a fiction species :x