Thanks for your critique. The bit is the bit Molly's trainer told me to use, I agree I need to make an extra hole in the cheekpieces though.
I agree we have a long way to go....She needs to be accepting of the bit and being in a big field isn't the best way to teach her to listen to my posting to match her tempo to it! I have some pictures of us riding in the arena on my other computer; I'll post them when the Internet gets fixed at my mom's.
I try to slow my posting with her and make it quieter, but when she wants to go she gets very headstrong and pulls on my hands so I end up leaning forward to get her head under control, leading to her fighting the bit even more. Her off-track trainer is an ex-steeplechainer, and I tracked her down after I bought Molly because I bought her when she was a wreck. She rushed into the canter, would NOT trotor canter slowly to save her life, so I found her original trainer from a YouTube video (I googled her registered name and found it). We sent Molly down to Jenni, the trainer, so she could retrain her. Molly was an amazingly responsive horse before she got in the wrong hands of someone who absolutely ruined her; Jenni couldn't believe what a different horse she was. She retrained her for 2 months, me driving down to take a lesson on Molly from her every two weeks, and this is the best she's been since she was ruined. Here's a video from before she was messed with; when Jenni had her originally: