No, I didn't miss that you changed it DarkKobold. I think it is fine now the way it is; just other people are debating whether it was actually played on the hardest difficulty or not.
I'd also like to say that I finished watching the run, and I'd like to say well done! Especially after reaching north parmecia the run is really great.
Having seen the run, I can confirm that playing on super would mostly just change the first half of the run. There are definitely several battles that would need different strategies, though, because you would be taking too much damage to survive.
The most active shining force forums are at
http://www.shiningforcecentral.com/
(as DarkKobold is well aware). All the veterans there play almost exclusively on super or on hacked versions of the game which increase the difficulty.
The fact of the matter is that the AI difference between Super and Ouch is virtually negligible, if it even exists at all. It is likely that Ouch was also meant to have the 25% boost to enemy attack values, but that the abscense of this boost wasn't noticed in playtesting. In fact, people only rarely play on super until they are told it is harder; after beating the game once on normal they figure they are ready for the hardest difficulty setting, and automatically assume that ouch is the hardest. It's not hard to see how playtesters might have missed this issue.
There's also evidence to suggest that at one time there may have been plans for "normal" or an "easy" difficulty to penalize monster attack scores by 20%; the raw attack values stored on the cartridge for monsters are 80% of their values on normal, hard, and ouch difficulties. For instance, the attack value of a mist demon in the monster stats database on the cartridge is 80; on normal hard and ouch difficulties they have 100 attack, and on super they have 125.
All it takes to give the super difficulty damage bonus to ouch difficulty monsters is changing a single bit in the entire ROM.