Bracket 4 Narset Enlightened Master Help

Hey everyone!

This is my first Reddit post ever, so bare with me.

I am dusting off my old Narset deck from 8 years ago, and I am trying to bring it up to about as powerful as possible without dipping into all the meta-gaming of bracket 5 cEDH. The list as it stands right now is this:

https://moxfield.com/decks/Ujgt4MH5-Emo8qyjLxiojA

I am looking for any suggestions that people think would make it more fast/consistent. My only real limitation budget wise is stupid expensive cards like original duals or the crazy expensive mana rocks, pretty much everything else is fair game.

Some thoughts I have had:

• Dump [[Proteus Staff]] for [[Generator Servant]]. Mana boost plus haste seems too good not to roll with, and I feel like the staff is a bit clunky anyways.
• Add in [[Manifold Key]]. Un-blockable and untapping a rock both seem solid to me.

Questions I have:

• What is the right amount of lands/rocks to go with? I am limited on rocks because I am at the point where if I add ones worth adding, they will be outside the budget.
• How important is land destruction in this deck? I have three MLD, which I think is possibly too much.
• Are cards like like [[Rhystic Study]], [[Smothering Tithe]] and [[Esper Sentinal]] worth it? It feels like they are dead draws later on, but it seems like everyone runs them in their lists because they are staples.
• How much stock should I put in buffing and making Narset un-blockable? I feel like its important because if you exile an extra turn or combat, but then stall out on the next one, at least you have put in a big chunk of damage, vs other high power builds it looks like they don't worry about it at all and put everything into going infinite as soon as possible.
• Is [[Buster Sword]] worth it? It can get a high value spell out of your hand if its stuck in there, but it doesn't provide evasion to guarantee combat damage gets through to trigger that ability in the first place.
• Should I add the [[Aggravated Assault]] and [[Sword of Feast and Famine]] combo? To me it feels like I don't need another infinite. but they also add value as individual cards, and they are both pretty easy to tutor for via [[Enlightened Tutor]] or [[Fabricate]] if I get the other naturally. I think this ties into the previous point, as I would likely cut [[Buster Sword]] along with [[Smoke]] to make it happen.

These are my thoughts so far. Thanks in advance for any suggestions. I am excited to get back into Magic again!

Cheers all :)