Section 2 contains a lot of grey area. Best to stick with convention. Plain snaffles of any type (loose ring is fine, Dees, full cheeks, and egg butt sides fade in and out of favor but are all “conventional.” Pelhams are fine too. Kimberwickes are not great to use and this is reflected in scoring by judges.
Thank you all for your input! I’m going to keep schooling her in the loose ring, as she seems to really like it. I’ll plan on showing her in her full cheek waterford though.
Side note - I only recently learned about hunter gags and spotted one in the wild for the first time in the 3’3 Performance Hunters last week at WEF. I was wondering if anyone else noticed. I wish I’d paid attention to the horse and placing!
The hunter gags have been around for at least 20 years, although they were a little more obvious in the early days. The first ones I saw were made from loose rings. The D ring version came along soon after, and blended in much better. Most people who show these days have probably seen a horse go in one, whether they knew it or not. 
I never heard them called “hunter gags” until recently. I always called that a “Myler with slots.” Perhaps the term is regional? I don’t know. They have been around for a while.
