You hit the bag with authority, and ook to be in great shape (physically). However, I noticed that you did not continue very long with the drill. How long are you able to sustain hitting the bag? You must be able to go longer than the other guy after all.
Also, it appears you tend to drop your left hand after each combo, while dipping your head and body to the left (actually bending-over your feet and legs, which leaves you unbalanced and takes too long to get back into combat stance) on a very consistent basis.
Lastly, palm strikes and elbows would keep you in the fight, rather than risking breaking knuckles and hands. You would be able to continue the same combinations, just use palm strikes/elbows.
I will post some of my training videos on this link a bit later for you or others to critic as well. Incidentally, I agree that certain, key combinations done consistently over-time become "bread and butter" techniques that should not let you done when and if the time comes.
Oh i have Zero Cardio, but being 6'5 and about 230 means I usually just KO folks immediately. But the bad cardio catches up with me when i have to run more than a mile after the fight ( Cops etc). Strangely Ive never hurt my knuckles, elbows are definitely good Close up though!
But Yeah i Never train holding my hands high, i only train punch power.
Good point about my (bad) footwork though!