Ramp and Atraxa lists usually still have a must answer effect or permanent. You'd be surprised what a Naturalize here or a Path there will do to those decks. The archetype itself isn't limited to playing lower power levels, it just doesn't offer much for competitive. If you'd like to post your list, I'm sure we could help you to bring it up a bit. It might also help if we knew how you were losing the game.

My guess from what you've said thus far is that your Feather list is a collection of cards that interact with Feather, some ramp, some threats, and some removal, but your list doesn't internally synergise well, doesn't construct an end game engine, and you don't have enough card draw. You probably are finding yourself missing land 4, castimg Swords on something, playing a Guttersnipe, and then dying to XYZ.