I'll cut 2 thoughcasts, go down to... 16 lands total? and that'll give me room for 4 drums and 2 etched champions
I want to mess with the standard shell a bit but I feel like the deck is basically "solved" and there's no real wiggle room for flavor or personal enjoyment
Welcome to Affinity, what I've been playing recently.
I take it you are missing Glimmervoids or Spires? 6 basics is a lot for the deck.
Also, running 8 instants is kind of a lot. I cut to two Blasts and 3 Thoughtcasts main, with a another blast in the board. You really want to keep your Artifact density up. Adding the drums will help there and also help give you some of the explosive starts, like Overseer turn one with Skirge and thopter out.
I ended up also putting a Champion in my board to keep me from starting so many games with a 3 drop in hand.
The cards for the shell are there and don't have a lot of good changes to make, but the derck does leave space on where to go with them. Good luck!