doubt a fertilizer change is going to make much difference your plant looks pretty good to be growing with flouros and while the buds may fill out a little more there probably isn't much that will help the yield at this point if you could get a better lighting system for your next grow im sure a hps would help alot.
there is alot of info on cloning on the internet and what works for you might not work for someone else would just keep it simple at first and use a propagation tray with dome and a rooting gel or powder, for a meduim you can use soil, or perlite and vermiculite take more cuttings than what you need as you may have a high failure rate on your first few attempts.