I used these standard items which people actually asked, "why don't u use that?"
I thought the same at start as well but considering that it's a lot better to prio. max resistance, life tab, cb & blow.
Personal I used the "standard items", life tab/cb/blow and had around the 50 resistance, and then when uber mephisto used conviction is was down to -xx
Mephisto is only powerful cause of his conviction - not if his accuracy or high damage hits.
The other uber bosses aren't that strong!

I agree with a lot of this guide, and one more notice, he doesn't use torch nor pots.
It was almost full life straight through the youtube film.
The gear might be something else than the "standard items" but together it's really unique.
I like this guide, nice job