I'd go with carbon.
You don't seem to want to try anything that's being suggested, but of the things that have been, carbon makes the most sense. Something has to change if you want to fix the problem, may as well start by adding carbon.
You don't seem to want to try anything that's being suggested, but of the things that have been, carbon makes the most sense. Something has to change if you want to fix the problem, may as well start by adding carbon.