Skellex, I think it seems great. I suggest removing the red in the deck, as it does not really work well in the deck. I would add 4 more of one more infect creature, and 2 more forests. I would add two low-cost growth spells, you can still keep the turn 3 win, but make the deck a little more consistent. I would also consider removing1 or 2 copies of the
Artful Dodge and
Distortion strike and bring in more buff spells. This isn't necessary, but it might make the deck a little faster. While I was building my version of the deck, I definitely benefited from reading and watching
https://www.mtggoldfish.com/articles/budget-magic-35-infect-modern.
It is the most basic version of your deck and my deck. It is really well optimized and might help you make the deck overall more consistent while keeping the speed.
(I wrote this comment in response to your's on my deck, and I wanted to put it here).