In the second duel, you should have won if you had left the hari or instead of this other Horus and left the area that the link pointed to free for ojama king to be untargetable
I didn’t really like watching the sub version of the show but i started getting into it after the issue with “trueman”. The Japanese version of Chazz did an amazing job voicing the Ojama dragon cannon master or whatever name you can think of for Chazz.
I feel like you threw the game in the end against Kashtira. None of the PSY-Frames have limits on how many times you can use their effects, so you could have triggered the PSY-Frames in the beginning more often and then Synchro, since the drivers aren't banished by synchro summoning (unless that continuous spell is in play, which you could have negated with PSY-Frame)