I am glad everything is growing well for you. We all break branches brother, I do it all the time, on tomatoes, on pot etc etc. Sometimes this means the rest of the plant gets thicker and fuller. In nature branches are also lost, to wind, to herbivores, general animal damage, eg things brushing/pushing past.
You can use things like Silicon to help make your branches more flexible, but some plants just dont want to be bent, as we try they thicken and resist us. These plants arent good candidates for SCROG, may be better as SOG or left to grow out nomrally.
Thanks for the update. No exposure to COB as I use CDM lamps which have plenty of consistent blue light due to the more efficient square wave ballast and lamp design, over say standard HID for example which is often very spiky. There are loads of good LED peeps here, i am sure someone will chip in.