This week I lower the taller of the two plants by taking it off the bucket I use to collect runoff and moving it to a smaller stack of drip pans. I'll have to empty them more frequently, but at least like this both plants are roughly the same height.
Besides the toasting two of the colas got from touching the lights, both plants are looking very healthy.
For all my grows I have been running unfiltered tap water, I've used a cal mag product as a supplement to the House & Garden Cocos. After looking at the municipal water report and seeing that my local water is both high in calcium and magnesium I decided to go without supplementing cal mag this time. In the past I think I may have actually had issues with toxicities or lockout, and now I wonder if it's because of the tap water + cal mag combo.