I think that running fetches and duals seem extremely risky what with decks packing wasteland & stifle seeing an upswing at the moment; with as few lands as elves run it just doesn't cope well with land destruction, especially as everyone and their mother will sideboard more mass/removal postside.
Whilst the white splash can be useful for sideboard material, the Mirror Entity maindeck seem overkill (since if you've got Glimpse+PoT+Wirewood+Tutor (for Elvish Visionary) you typically just win anyhow, and there aren't any infinite life combos seeing play atm. I personally think that there's enough good options in green that the white splash is not worth it, but if you do I'd use
Burrenton Forge-Tender for Firespout/Dredge/Random. In the same vein, without the splash Birchlore Rangers looks.. meh.
Running Dryad Arbor with anything less than 4 GSZ seems like a waste. In fact, anything less than 4 GSZ is probably suboptimal since it's just that much better than the alternatives. Also why less than 4 Visionaries? Pair it up with Symbiote and you've got one of the best card advantage engines in the game, and it's still extremely solid on its own.