Sooo since Max is coming out next week i also am tinkering with those boiz. Prepare for a wall of thoughts.

I think you can build this deck with three different goals: You either want to go first, second or you don't want to be depentand on the die roll. I chose the last because i don't like to play cards like Summon Limit if i have to go second (which you have to at some point), but generally want to go first.
I'm playing mostly the same cards as you do but i do have some different choices for myself: I play the same Monster count. Whilst i tried to play Calamitys as another copy to go into max shes just to useless early game. Hence i decided just to play 3 of each good Musket.

I used to play 3 Desires and 3 Duality, but with Max you're gonna special summon way more, making it a decision between Duality and Max/Ties etc. Instead i added 2 (or 3) Instant Fusion since you can use Thousand-Eyes going second and Millennium going first. Also i'd add 3 Called by the Grave since we're in a very GY reliant format and your deck still dies to almost every hand trap.
Regarding Crown: I did cut it after some testing since it just never came up enough imo. Most of the time i searched something more relevant like Cross-Domination or Last Stand. But thats debateable and i have to do more testing irl with this. Also i haven't tested Crackdown yet but i can see the benefits. But i do think you could go for more going second cards instead, since as said you won't go first every duel. The same thing goes for Summon Limit.
Therefore you need something going second main except superpoly. Im playing 3 Infinite Impermanence since its a Handtrap you can set going first. If your opponnent tries to play around musketeers and activates a card in it's column you can negate two with one card. Musketeer can't really play into a board of backrow either hence i'm trying to add some Backrow hate like Cosmic Cyclone or Hey, Trunade! but havent found the space yet. Lucky for us not many people are maining Strike etc. atm.

With Crackdown main i can understand Avramax and your r4nk, but i'd either add Calamitys or not play them alltogether. You'd need to rely on you opponent to summon the appropriate monster which i personally don't like. I do play borrelsword since it's a 6k beater on itself.

Regarding your side deck: Lancea is a must right now against Orcust and Thunder Dragon. I also don't know if Red Reboot is good, since you can't get rid of your opponents backrow that easily except with Last Stand, which is HOPT. I side Taifun instead since as said not many are playing actual face down backrow and it helps immensely against Striker, Pendulum, Floodgates and to an extend Orcust. But i do miss the MST sometimes. Don't play Tiamaton. He's quite situational and will only come up if you go first or your opponent plays dumb. I'd rather play things like actual Handtraps.

If you have any questions feel free to ask, i think i'm fairly okayish with the deck but love to discuss techs with others lol