Feed them. In my opinion adding additional mouths to feed into the mix, CNBG or not, will only serve to worsen the problem.
Even the best BG genetics available will disappoint in the absence of food. Number one on my list would be the implementation of a supplemental feeding program, and give that some time to work.
I've mentioned before, and this is just me talking, that genetics are the icing on the cake...lay the proper foundation first, to reap the maximum possible benefits of a particular strain or genetics.
