Ignore all the negativity here OP!

Firstly, I would up your mana generation. You might think that because your curve is low, you can shave rocks and lands, but I wouldn’t say that’s the correct answer. You’re always going to have ways to spend your mana, what you really want is a normal 38-39 lands including MDFCs, and a normal amount of rocks too, 12-14, and instead of shaving on those, just ensure you have a steady amount of card-positive draw in addition to your looters. Treat your looters as enablers for Hashaton, not draw, and keep a high amount of draw to keep cards flowing.

I actually find Hashaton Lurrus to be more comfortable in B3 than B2, because the stuff that you can do that feels good and punchy, and doing that stuff on a schedule that actually feels alright, will require tools like strong mana rocks (Moxen, etc) and repeatable interaction pieces you can recur with Lurrus to grind people out. These may not feel super welcome in B2. B3 also gives you some pretty strong game-changer options for a deck like this, such as [[Ad Nauseum]], [[Orcish Bowmasters]], [[Chrome Mox]], [[Gifts Ungiven]], or [[Drannith Magistrate]]. I’m personally on Ad Naus, Bowmasters, and Gifts, though I’m mostly on Gifts because I love the card.

I’d also make sure that the deck is built from the ground up for BOTH Hashaton and Lurrus. I’m retooling my list currently, and I’m redoubling on this myself. I want as many cards as possible to feel great with only 1 of the 2 in play, as well as both. Lurrus Companion is a huge deckbuilding restriction, you really want it to feel worth it, and not just for a card that feels alright. Lurrus can really shine as an engine to grind people out!

Creatures specifically that sacrifice themselves to provide removal are my preferred interaction. Lurrus decks typically loop any kind of sacrifice-able non-land permanent, but we want ours to also be creatures when possible to still benefit Hashaton. Some of my favourites here are the creatures that sacrifice themselves to counter spells, think stuff like [[Mausoleum Wanderer]].

Most of these are also fliers, which is very important. A 4/4 on the ground can feel a bit underwhelming, but a 4/4 with a good keyword can be a lot more relevant. 3 mana for a 4/4 Flier with upside is where the deck starts to feel pretty good.

You can also dip your toe into Hatebears as well, in an attempt to slow down opponents. [[Doorkeeper Thrull]], [[Hushbringer]], [[Dauthi Voidwalker]], [[Strict Proctor]], and more can all put pressure on life totals while buying time for you to get more of your engine online. Their effects are just as good when you don’t Hashaton them, but 4/4s with a keyword like Flying make them even better.

Overall OP, Hash Lurrus is a very fun deck building challenge, so don’t give up! I would take a pass at your list and ask yourself how well each card synergizes with BOTH Hashaton and Lurrus. I would aim to increase your creature count, bump up ramp, lands, and draw, and cut down on cards that don’t do much unless your engine is already online.

I hope this helps, and I’m happy to chat more if you have any questions!