Took this to another Store Champ Tournament, went 3-1 in swiss and one win out of one game during cut. The loss was to a Hasty CI deck, which is, as any CI, a tough matchup. I think a well timed EStrike followed by another could work, but with zero HQ pressure it is quite hard. :)
Anyway, this is the next iteration of Dumble Zero.1 deck (https://netrunnerdb.com/en/decklist/40638/dumble-zero-1-sc-winner-4-1-) with only a few cards switched. I wanted to try out Peddler (for faster Wyldcakes and instant speed Parasites with Sifr) and it seemed to be a good call.
Also changed my view on Sifr in this tournament. It pretty much won me a game combined with Parasite and helped a lot in others. I'm not sure you need more than one, though.
This time Aaron was useless as nobody was playing yellow. Still, it seems like it's a decent use of influence usually.
If you want to win this type of deck, check out the corp I was playing here: https://netrunnerdb.com/en/decklist/40763/sifr-hater-v2-small-sc-top-seed-winner-