Agreed on the Heroic Fight. But you need to do that in advance. This allows you to get a similar result after the Fight resolved. Therefore, I'd say using Might to get the ESCharge is more of a flexible/situational thing. Such as you had a lot more success with your attack than you expected and you enemy is now disordered and depleted and the second charge would allow you to take them out. Worth the Might.
But often you can get a feel in advance for how the Fight might go, and that's the time to call Heroic Fight. These "lesser" uses of Might (Heroic Charge/Fight or dice modifiers) are where I think Captains can prove their worth, allowing your Epic Heroes to stick to doing things Epic.
Always the factor of Captains having a disadvantage if someone Epic Strikes during a duel, but we've already had many discussions here on OR about that.