Thank you for your report!
I was afraid to play against you and your 4 null rod md (really isn't it a bit too many? According to
http://www.mtgoacademy.com/unlocking-the-vault-81-mtgo-holiday-festival-vintage-championship-analysis/ rod was useless against 50% of the top 32, and even against me if you draw 2 null rod and my only artifacts are 2 moxes - average game - you are losing "mana advantage"), I guess I got a bit lucky.
I don't like the sideboard that much... Do you need 4 cage + 3 relic? Dredge is almost not played at all. I would play few Ingot Chewer for sure, Energy Flux is expensive and Chewer gives you more choices.
I was a bit confused about Steam vents, thought it was a budget choice. Don't you prefer few basics instead?
I saw you played the deck quite a lot, so you are probably right, but I would like to know why

This is what I played:
http://hpics.li/46b2a27Gitaxian Probe has been very, very good: to know if I should bait a misstep or play a trall, if I can go tinker, what I need to keep with preordain, delve...
Notion thief has been disappointing, probably too "obvious" (especially against LSV). The singleton daze was nice.
I don't remember all my matches:
R1: UR delver, close
R2: Unlucky MUD, I think he mulled to 4 g2 and I have like tinker turn 1 g1.
R3: Oath, g2 he has nuts (oath + orchard with fow turn 1), g3 I have cage + Notion thief.
...
R5: Lose against Efroelich with UR delver
R6: Win against Lejay. One strange game where I almost lost when he is on mull to 4 and I win by Sowering his Thalia and beatdown.
R7: Win against LSV with UR delver (t2 win with time vault on g3)
R8 & top8: XShockWaveX
Top 4: Lose vs LSV. not especially close, but I would have won pretty easily with a pyroclasm-like in g1 (he commited a lot on the board w/o backup).
Very happy of course to get this VMA set!
I changed my list since then:

No Mana crypt: too dangerous, can lose the game even after a time vault/key, I lose enough hp with probe, I don't need too many colorless mana (especially since I have cut tezzeret), less artifact = less problematic null rod...
0 snapcaster: maximize the efficiency of delve spells (which are very very good now) and of Yaugmoth Will, cage is less a problem and I can play Engineered Plague on human (insta win against straight UR delver with empty board).
1 Slice and Dice: the slot I am the least sure, could be pyroclasm, toxic deluge, bolt, another pyroblast...at least this one is never really useless.
1 Negate sb: to counter t1 out of a mox, in mirror. Not sure as well, I would like to test other good cards to play on turn 1 in mirror, such as Dark confidant, Young Pyromancer, Bitterblossom... or just another Pyroblast.