Super experiment!! With such a small cask, the whisky is seeing much more of the cask and Port. It appears you are checking often to ensure the whisky is doing well. Keep it up as Port can cross the line without warning with the nose being beautiful and the taste becoming rancid. If you stay on top of it, you will have some good drams to enjoy in the evenings after dinner. I currently am working on LIVING BOTTLES; an "all" malts; an Islay; an Ardbeg; and a Laphroaig.
Continued Good Luck with your experiment.