I'm just chiming in that Diff 8 is really hard and a pretty giant step from 7.6. I smoked the AI on 7 then went to 7.3 then won pretty convincingly on 7.6 but on diff 8 oh my. I can't remember why I died repeatedly but I don't think I made it past 2 hours or past the first cpa. Hell, the first wave in diff 8 can get pretty dicey. You have to spend a lot of resources on defense and use a lot of your fleet for defense. I think AI type plays a huge role in actual difficulty as well, the AIs that don't send waves make the game much, much easier. The AIs launch waves simultaneously usually so 2x wave sending AIs can overload your defenses a lot more than one wave sending AI can. God forbid you select mad bomber on diff8+. I'm playing a high AIP 7.6 diff game currently and if I can master that I'm gonna take another shot at diff8.
I think an after action report with screenshots and notes are more useful than a long video. Unless you are micro'ing like in a game of starcraft then videos shouldn't show that much. Or even upload a save game at different spots so someone can see everything, I dunno.