Pretty much.
I just watched the third round, you did much better with stance there but it's still not 100%.
It takes a good while to nail it even when you know what it's supposed to be. Your shoulders/torso is too square and open currently.
Pro boxing is not the best place to look for a guide on fundamentals because so much of it is about both setting traps and entertainment.
In pro boxing Jorge Linares and Naoya Inoue are good examples of the conventional side on stance done well. Both actually use longer than necessary stances because it allows you to shoot in and out for meaningfully powerful straight punches.
Pro boxers, especially Naoya tend to be front foot heavy at all times this allows for power andiand accuracy in your jab but removes power from the right hand.
If you watch amateur boxing by Russians etc. They spend a lot of time on back foot doing "provoking jabs" with no power in them. They can pendulum bounce back and forth (and side to side) in the rear foot heavy position and at the right time simultaneously throw the right hand and shift weight to front foot, for a powerful right hand.
The shift of bodyweight together with an aggressive snappy shoulder turn from rear to front puts the maximum meat into a straight right punch.
After you have learned all the fundamental components of your side on stance, straight punches, blocks, Parry's and counters which are used at long range.
Then work on hooks! Where short arms,a turning of the body and shifts of bodyweight from left to right (as opposed to forward and back) is where power comes from.
