I would not use procing weapons, including PGT as they draw aggro and evade isn't even in the game. PGT might be nice for soloing though.
A progression might look like this:
1
Spear or equivalent MH (Main Hand)
2
Spear MH
Minotaur Battle Axe OH (Off Hand)
3
Dragoon Dirk MH
Minotaur Battle Axe OH
4
Jambiya MH
Dragoon Dirk OH
(OPTIONAL If they are available on the cheap, use until they start procing at 27–then bag for the times you need a snare proc)
Serrated Bone Dirk MH
Serrated BoneDirk OH
(OPTIONAL If you can find a pike on the cheap or can't find a Jambiya and can't afford a Gloomy)
Glowing Iron Pike MH
Jambiya OH
5
Gloom Water Harpoon MH
Jambiya OH
6
Gloom Water Harpoon MH
Polished Steel Dirk OH
Then at the super high end (dragon loot):
Crystalline Spear MH
Gold Plated Koshigatana OH
Once planes come out there will be some upgrades, but I forget what is all pre vs post-revamp, and you'll know what you're doing by that point.
You can mix and match from the list, and there are some more exotic pick-ups I left out (esp. for off-hand), but just try to get the highest damage piercer you can get main-hand, and the best ratio you can get off-hand.