Yeah, using Port in between Stax and Tangle is pretty good. I've always been a fan.
How are you liking no metamorphs in the maindeck? I always preferred them in the sb.
I like that Spyglass is proactive as well as reactive. Sure would have been great if it had legs. I'd run it, but then I wouldn't have very many win conditions left in the deck. Truly missing those extra 3 Lodestones....
I'm back and forth on Expedition Map really. Sometimes it's amazing, and then sometimes it's just clunky. It seems great in your list since you run utility lands. The only singletons I use are Tolarian Academy and Strip Mine. I'm running a similar land count as you (22) and kinda want them all. I love rarely having to mull.
I don't think the lone Chalice will make or break the deck to be honest. But I'll still keep the dream alive because on turn 1 it prevents permanents hitting the board and has a huge impact on the game.
I'm testing out a more proactive card and it's doing surprisingly well in Stax. Not sure why I haven't really tried it before. Once I see some more results I will share my findings. Might be a tournament I want to take it to first ;)