Hey Blake, like most people have said above me, try not to stress it as this is going to set you back. I am in exactly the same situation after 18 months nearly, I struggle to go over the top in a breakfall from ski-koda-gishi (correct spelling)? It is so frustrating as sometimes it works and sometimes it doesn't and when the technique goes on I just stiffen up. I'd say it puts me back weeks. This is more prevalent on my left side also and I can often be found with a lip on in the corner moping about it lol. Give it time, just keep practicing and it will come,concentrate on what you do well and try not to beat yourself up about getting something wrong.
Good luck bigman