I rated Triumph lower, but it should be higher. I played several games where Triumph was just the dominant strategy. Common mistake is to imagine gaining a bunch of cards, capped off with a Triumph. NOPE. Buy lots of Triumphs. Common line at end of turn: "And... I'll buy 3 Triumphs, gaining 6, 7, and 8 VP." Give Dominate a run for its money.
Re: Storyteller. I imagine most of the people who play on Twitch are better players than me, but I often find their Storyteller plays bizarre. For example, adding Storyteller to an engine just to sift a few copper. With Storyteller, you don't really need other draw, you just need payoff. After all, silver = lab. Storyteller is weak if you're stuck thinking that you only add payoff to your engine after you're drawing deck.