I'm not sure I understand your plan regarding Daze, subbing them out game 1? Only playing them if you're going first? None of that makes sense.
What are you Dazing on turn 1 that isn't a counterspell in defense of your Reanimate? We're not a control deck, you can't afford to counter their spells just because you can. Our best creature against Grixis Control is Griselbrand drawing into either countermagic or enough gas to reup once they find a way to get him off the field. And since most likely you'll be tapped out, paying 7 life to draw into Spell Peirce is a nonstarter. So yeah Daze has a laundry list of downsides, but short of risking that 5th copy of Force of Will and hoping nobody notices, there isn't much free protection to draw into in a pinch. And if you're talking about expecting a control slugfest post-sideboard, Flusterstorm is better anyway. Reanimator is an A+B combo deck, what they're doing unrelated to your combo is superfluous. Don't get distracted because they cast Brainstorm in response to your Thoughtseize.
And then not to be cheeky, but the fastest possible UB Reanimator build is just RB Reanimator.
The tools you gain in blue is Brainstorm and Ponder to sculpt your hand, which is the opposite of fast; and Force of Will and Daze, which while good being free and all, but Unmask is just as effective if the goal is to 'combo' that turn. RB is just better at going fast, so any build I can come up with will sacrifice it's resiliency for speed and also not be as fast. Just a sub-optimal list in all aspects. Yeah more Lotus Petal and Dark Ritual will give you assets to T1 better, but then why play Ponder?
The super grindy game plans have been aided by
Collective Brutality and
Jace, Vryn's Prodigy. Spellseeker might play into that, but CMC 3 you're already at our topend curve for a mediocre tutor. And your examples of utility cards, I'm not sure I understand the utility of
Cabal Therapy or
Extirpate. I'd only consider Cabal Therapy after maxing out on Thoughtseize and Duress first, and then I still think I'm better served with Collective Brutality. Any what role is Extirpate playing? Surgical Extraction has the better cost, and I'd rather play Faerie Macabre when I need to bother with someones graveyard. So I understand the sentiment, but your question doesn't make any sense to me.
Sorry if that's not more helpful. Reanimator is in a difficult spot, the hate has never been more effective and easier to cast. Most players don't even think about us when constructing a sideboard, we just get stuck in the middle of a venn diagram of hateful splash damage. So even the most perfect build will still be unfavorable against most of the top decks.