Both in your video and in a post, you've mentioned the leaves floating over to the outflow and leaving the pond. (Sorry, pun not intended).
How about encouraging the floating FA to do the same? I've moored a small outboard boat at one end of my pond, opposite the overflow, and directed the prop wash to push both algae and leaves to the exit area of my flow through pond. This has helped to corral the debris to one spot. I've then raked some of it out and smiled as some of it left on its own. My motor is gas powered but an electric trolling motor may also work, especially on your long, narrow BOW.
A floating rope used to surround the floating FA also may be of benefit. You could tow it to the outflow area in a large mat. There are threads on the forum about sticking zip ties or the like at intervals through the floating rope to catch the algae.
