nice work oldschool,
i suggest you to post-edit the video and make a clean comments at the hands
in the video it's clear that you never played an HU match, but we need to start somewhere
its not clear to me why given the raise dynamic with the fish you didn't raise with the nuts on the low flop, the fish could 3bet you light and you can build a large pot with the goods and vs passive fish i always bet the Fh somewhere in the hand.
given the fish preflop aggression and his passive play after the flop i will always call the 3bets with playable hands and stub if checked to.
last think, my standard open with the fish is x3, you want to start to build the pot IP with an huge skill advantage