With that many copies of
siren lookout you might be able to afford putting another card in instead of the 23rd land. That said, I like
chart a course since most of the time the Flyers that are pirates are going to get through and allow you to draw two cards for two Mana when you're going to be attacking most turns anyway.
You may also want to think about an
Aethersphere Harvester or two since you'll have smaller creatures crewing a bigger one that will be able to block most midsize threats or attack and gain you life in the process.
I am running a similar deck myself and I like a lot of the early game interactions. Personally, I am still trying to figure out how to be as aggressive early game as possible and to help eliminate flooding out on lands