Wow, cool video. Nicely done.
With the angle you are fishing from in the yak I think you really need to beef up the rod, add some length and use braid IMO. You have to WHAM that hook home. Tough as you ave little leverage in a yak but I really don't think you set hard enough, you just liftd up on them and the thick aguge hook never got in. When a fish blows up, lower the rod to the water then slam it back, try to get the fish up out of the junk and hold the rod high. You need a real heavy rod as a big fish will dig in the junk and if you don't get it up then your pulling it through a jungle.
This is how I fish in a bass boat standing up and it can be a challenge, can only imagine in a yak.
I use a 8ft H, 65lb braid, and a very hard hookset to get the fish up and surfing back to the boat.
Keep the video coming