I'd never cut Piledriver or Fanatics for Weirding as it doesn't fill the same role. Weirding is IMO a substitute/addition to Gempalms, that took the creature removal slots in the last years. Piledriver is sort of "finisher" in the deck and Fanatic is general utility (against grave-based combo decks, fish decks, Jitte, etc)
As I suggested a couple of pages ago, I'd play that list:
// Lands
4 [TE] Wasteland
4 [b] Badlands
4 [ON] Wooded Foothills
3 [7E] Mountain (1)
4 [ON] Bloodstained Mire
1 [P3] Swamp (2)
2 [MM] Rishadan Port
// Creatures
4 [7E] Goblin Matron
4 [AP] Goblin Ringleader
1 [LE] Gempalm Incinerator
4 [ON] Goblin Piledriver
4 [SC] Goblin Warchief
1 [SC] Siege-Gang Commander
4 [US] Goblin Lackey
2 [LRW] Wort, Boggart Auntie
4 [10E] Mogg Fanatic
// Spells
4 [DS] AEther Vial
4 [MOR] Warren Weirding
Note that the list is 58 cards so you can add 2 goblins of choice depending on meta (Goblin tinkerer, Sharpshooter, more Gempalms, Mad Auntie...), but I see no reason to cut Fanatics, Piledrivers and Matrons (especially Matrons from the deck)
I'm with you on this, I didn't find port that effective anymore in this meta. I'm down to 2 at the moment, but maybe I'll cut one or both in the future, depending on cards I decide to run and meta.
Don't do it. Matron is the Demonic Tutor of the deck, it allows shenanigans with warchief and Piledriver, tutors for Removal against aggro-control, but it's great too vs control, where it's part of your card advantage machine (tutors for Ringleader/Wort).
What results did you put up in youre testing? Bad thing Weirdings sucks hard in the mirror, but I can see the aggro-control matchup much become a lot better.

