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I play tested your deck against mine. I found your deck to be extremely mana hungry and most of the time pulling creatures with huge mana costs. I had no issues getting to 5 mana but struggled to get out an Aetherling or anything stronger. I played 4 games and the one that your deck won got lucky on a Unexpected Results cast with a worldspine wurm. You need to up your mana count to 24. Your better off dropping the Darksteel Ingots for that extra 4 mana. The common scenario I ran into was having an ingot or burnished hart in hand but couldn't push it through because of constant attacks off the start. Your deck died before you got the mana to do anything and if you did get an aetherling out, I just ignored it.
Here's my deck if you want to see what you played (Selesnya Midrange) http://tappedout.net/mtg-decks/selesnya-midrange-theros-fnm-ready/
If you're looking for land ramp, Ordeal of Nylea is awesome with it, for instance
T1 land + Favored Hoplite
T2 land + Ordeal of Nylea on the hop + attack 2 counters
T3 land + Ordeal of Nylea on the hop + attack = 5 counters and they both get sacked for 4 aditional lands
meaning 8 lands on board by turn 4, which is pretty damn good xP
A general rule of thumb, is that anything over seven mana really shouldn't be played in standard. It's just too slow. And while Theros is turning out to be a slower format than Return to Ravnica, you still can't really have 6 six drops, 3 seven drops, 3 eight drops, and 3 eleven drops and expect to get them out. A deck that just rushes 1-4 drops is going to ruin your day in four-six turns, before you even get the mana needed for your fatties.