How about the following change:

-1 Darksteel Colossus
+1 PyriteSpellbomb

-1 Volcanic Island
+1 Forbidden Orchard

-1 Tinker
+1 Salvagers

Consider some cases:
You resolve the Oath of Druids trigger
With Dark Steel Colossus, you have 3 turns to win.  First turn summoning sick, + 2 attacks.  Sometimes you win just by emptying your deck into your graveyard, but that's the same with Salvagers.

With Salvagers, you might win this turn.  Say, around than 50% of the time.  If the lotus goes into the graveyard you can get arbitrarily large amounts of mana, and use it to do some pretty sick things.  If you can trigger Oath again, you almost assuredly win if you can resolve Krosan Reclamation to avoid decking yourself.

Consider the gifts stack:
DSC version:
tinker, time walk, recoup, y. will

There are lots of different cases, but some of them require at least 7 mana to win "this" turn.

Salvagers version
Salvagers, burning wish, recoup, Lotus

Assuming they have no counters, no matter what combination of cards they give you, you need only 6 mana next turn to win.  If they give you wish and recoup, you wish for Reanimate from the sideboard and bring back salvagers, salvage lotus, get a lot of mana, and then recoup gifts to get pyrite spellbomb for the win.

Yes, you do lose the naked Tinker for Colossus on turn 2.  On the other hand, Salvagers in hand is a lot better than DSC in hand.

You are more vulnerable to pithing needle.  But you are much less vulnerable to Goblin Welder, who is played way more than the needle.  You are less vulnerable to Gorilla Shaman, because you don't need Tinker-food.