After play-testing on MTGO, it has become apparent that this deck needs to be more focused. Right now, it is split pretty evenly between fling and go-wide to the degree that neither materializes quickly enough.

In particular, the equipment is clunky and not very mana efficient (with the exception of the rings.) Krenko, Mob Boss is critical so upping the count to 4 is imperative. I'd also like to replace the Sword of Kaldra and the Vulshock Battlegear with additional copies of Dragon Fodder and Hordeling Outburst.

I am also toying with the idea of splashing white for Anointed Procession so that I can double my tokens.

Reckless One is a real lightning rod and usually doesn't last very long. However, that typically works to my advantage because it is not a major piece of the deck's strategy. As such, it makes a great decoy to draw out my opponent's removal. I may consider adding an additional copy in place of Goblin Cohort.

Goblin Sledder is a sneakier way to fling. I may consider adding an additional copy in place of Goblin Cohort.

Spikeshot Goblin with a Ring seems like a good plan, but he typically doesn't get equipped until turn 4. So he would do 1 dmg on turn 4, 2 dmg on turn 5, 3 dmg on turn 6 (cumulative total of 6 dmg.) And this is assuming you had the mana open to tap him each turn. Meanwhile, you could be playing tokens to chump. It might not be all that bad. The best way to use Spikeshot is to play him late after Krenko, Mob Boss has had a chance to swell the ranks. Then Spikeshot looks very unassuming when he comes into play. But dropping a Firebreathing on him and pumping him by sac'ing goblins through Skirk Prospector makes him into instant death. Also, a Goblin Sledder could pump without the need for Firebreathing or the Prospector. Almost makes me think that we should replace the Prospectors with Sledders and just go for it. But the Prospectors are nice to have when you want to squeeze a spell in (Voracious Dragon.) But, really, when I included Firebreathing and the Prospectors, it was with the intention of using them together. Why use two cards to do the job of one card? Furthermore, Sledder gives +1/+1 instead of +1/+0, which could be used to protect my more important creatures from burn and removal. At least with Firebreathing, you have the option to use Mountains instead of goblins. But, with white being splashed, Firebreathing will be less reliable.
---------------------------- Update --------------------------------
So, Spikeshot Goblins and all equipment have been removed. Goblin Sledders have been upped to 3. 3 Prospectors, 4 Krenko's Command, 4 Hordeling Outburst, 4 Dragon Fodder, 4 Voracious Dragon, 2 Airdrop Condors. Added 2 Anointed Processions. This deck is lethal on average at turn 5 or 6. It is very consistent.
---------------------------- Update -------------------------------
Should probably replace a Goblin Sledder with a Prospector.
---------------------------- Update -------------------------------
Play-testing on MtGO has been insightful, but also discouraging. Board-wipes and targeted removal are ubiquitous. This is going to force me to include some removal of my own in the sideboard. Demystify and Angelic Purge seem like good choices. Angelic Purge's creature-sac'ing is very reasonable in this deck.