Hiya! I really like this list. You've got some cards that I've never seen for Feather, the Redeemed before that I'll probably be adding to my list.

With that, I've got a few recommendations.

First off, I recommend you bump the land count up to 37-38 lands. I've noticed Feather decks tend to be very mana hungry, and so it is really important to make your land drop every single turn. Without a copy of Land Tax, that just won't happen every turn with only 34 lands (assuming you play under the London Mulligan).

The other is adding more ramp to your deck. I noticed you counted cards like Land Tax and Armillary Sphere as ramp. As great as those lands are at securing your land drop and fixing your colors, they are not ramp cards as they don't provide you with more mana than you would have access to otherwise. I recommend adding in two-mana artifacts that tap for a colored mana such as Arcane Signet, Boros Signet, Fellwar Stone, Talisman of Conviction, and the two Diamonds Marble Diamond and Fire Diamond. Not only will this add to the ramp of the deck to help with the need for more mana, these I've found playing my version of the deck let you play a mana rock on turn two, and then cast Feather on turn 3 with the ability to hold up mana for a protection spell.

With that in mind though let me know how the deck has been playing, I'd love to hear about it!