I can understand that, Rusty I have the same set up but looking at what you did with the motor mounts I believe you may have torqued the plastic on the mount to much causing it to buckle. It has taken a lot of work on my end. When it came to my motors the screws end up hitting the motor so I took another carbon fiber mount disk and bored out the holes so the head of the screws would clear and allow to have to other plate sit flat. Then from there I found that I was getting to much vibration from the plastic, it just could not handle the motors, so I ended up taking straight pliable aluminum, curving it to my needs, then add electrical tape up the whole arm binding the two together, relieving the pressure off the plastic mount extension.
From their in the mean time which ended up taking 2 months to figure out I built a deck between the landing gear to support my camera mount, while allowing enough room for my battery. Like I said it has taken a long time and now instead of having an agile light craft, I have a 3000g tank. However if I put a 4s 6600mAh battery on it I am getting around 11 minutes for flight time. If I explore other options or had to do it differently I would have taken another path oh well.
However here is a good result of my finished product, a video straight out of the camera, with no anything, no de shacking just raw. I have seen better but I am happy with this, the topic may be boring but it will give a good Idea what you can get out of it if you want.
No matter what you do from here I hope this helps in some way.
stay safe and fly straight
Jack