Not having any Lumbering Falls when you're running Sylvan Advocates seems wrong to me. You could easily splash a 3rd color to help with converge and add more good cards to the deck. Adding black would give you good removal and the ability to use Hissing Quagmires with your advocates. Also Transgress the Mind is good against any control decks you may face. If you don't want to go fully into a 3rd color, I 2nd the suggestion above that you add a few Beastcaller Savants to the deck, perhaps moving some Tireless Trackers or Sylvan Advocates to the SB or replacing the Attune with Aethers with them since you don't have the different basics to fetch up.

Great feedback! Thank you!

I tried three matches on MtGO with 4 Beastcaller Savants instead of 4 Tireless Trackers, and I was pleased with the way the deck flowed. I was able to bring down larger Skyrider Elfs (in the 3/3 to 4/4 range), and the Woodland Wanderers were a more consistent 6/6.

The Tireless Trackers didn't feel like they made much of an impact in the games I played prior to the switch. Most of the time, they'd get fried before I could even generate a clue.

I didn't even consider using any man-lands to take full advantage of Sylvan Advocate, preferring to stick with untapped lands for better versatility on the fly. that said, I'll try to work in either Hissing Quagmire and/or Lumbering Falls and see how it plays out.