You're probably right about the 'cheap' moxes and petal, but i put them in to still get some accelleration. Although with the chrome mox it's hard to take out a buisiness spell, the tempo often makes up for it. That said, i'd rather not play it for the same reason you give. There were a lot of situations the Mox did nothing, but there were also a lot of situations i would've liked a mox but didn't have it. Mostly this was against control and combo. I'm still not sure about it, though i'll probably cut them.

The Dart was great for me, all day long. I was even thinking about going up 1. That's metagame for ya...

Kataki sounds great, i'll try them out.

Are you kidding? Mishra's Factories won me a third of my games. Against control its an uncounterable threat and against aggro it's a great blocker.

I played the deck the deck to a 26st (out of 188)  place at the Open Dutch Vintage Championship with a 5-3 record. With that i placed 4th on the unpowered ranking, netting me a badlands and 12 Ravnica boosters. The unpowered decks above me were FCG, another Goblin deck and Fish. The only changes i made to the deck, were to replace the moxes and the lotus for a lotus petal, a mountain and a chrome mox (making me unpowered), and i replaced 1 goblin vandal for a gorilla shaman. This was all done because i didn't have the others (not 4 Vandals, shame on me). I must say, this deck is a blast to play and can beat a lot of the decks out there. I played against:

R1: Janky metagamed Stasis-deck, with Birds/Instill Energy, win
R2: Bad Goblins, with only land and Goblins, win
R3: Fully powered Uba Stax, loss
      This guy totally blasted me away both games
R4: Fish, win
R5: Fully powered Ravager, loss
      3rd game he mised a trinisphere of the top, otherwise i would've won with the vandal in my hand
R6: Fully powered Gifts, win
      He was the wrong guy, so technically he was over 10 mins late at his table, which cost him a matchloss. I got a warning for playing wrong opponent . Nevertheless, we finished a game and i won
R7: Fully powered TPS, loss
      Baaaaaaaad matchup. Maybe if you draw insane and they don't, you have slim chance, but after our match (±5 minutes), we played another couple of games and i lost all. Even    when i had turn 2 Pillar with REB backup he just won on his first turn (well, second, because of Time Walk)
R8: Semi powered Bird Sh*t, win

All in all, i wouldn't change anything to the original decklist. Every card in the deck has its place and is important. Chrome mox and Lotus Petal weren't stellar as replacement, so i might change them to land/mox diamond, or only the chrome to a land. If you cut white from your deck, you will lose. Especially the STP's won me a lot of games i otherwise wouldn't've won. Genju's were great, although sometimes i didn't draw them enough, and sometimes i had all three, but those things happen.
As for the sideboard, the only thing i didn't like were the pithing needles, not doing enough. Maybe Fault line against FCG and random Nimble Mongooses (Mongeese?), and to a lesser extent Fish (Factories, M.Mage, Lavamancer, Old Man, etc. no flying though). Maybe Balance isn't such a bad idea after all (i've seen it mentioned here). Against random decks it's probably as good as Needle, but i might be completely off here.

To everyone ho tries to take white out for anything else, don't. Or play a different deck.
To the creators of the deck, thanks for sharing the fun.

Joeri