UB-noughts

So I built this deck the other day because Dreadnought is so freaking awesome. I more or less used inspiration from noughty-painter and deeznoughts. The deck ran well going 6-1-0 in swiss but losing to Oath in Top 4. Any suggestions on strengthening it would be awesome. My SB was weak sauce so I could use some help there.

Mana Sources//

4x Underground
3x Polluted Delta
2x Flooded Strand
3x Island
1x Mana Crypt
1x Lotus Petal
1x Black Lotus
1X Mox Jet
1x Mox Sapphire
1x Mox Ruby
1x Sol Ring

19 Mana Sources

Creatures//

3x Dark Confident
3x Trinket Mage
4x Phyrexian Dreadnought
1x Darksteel Colosuss

11 Creatures

Other Spells//

1x Merchant Scroll
1x Vamp. Tutor
1x Demonic Tutor
4x FoW
3x Stifle
1x Trickbind
1x Extirpate
1x Ancestrall Recall
1x Rushing River
1x Tinker
1x Engineered Explosives
1x Aether Spellbomb
1x Pithing Needle
1x Tormod's Crypt
2x Duress
1x Yawg. Will
1x Time Walk
3x Thirst for knowledge
1x Ponder
1x Brainstorm
2x Sensi's Divining Top

30 Other Spells

SB
4x Spellsnare
1x Tormod's Crypt
1x E.E.
3x Pithing Needle (Too Many)
1x Gilded Drake
1x Duplicant
2x Duress
1x Echoing Truth
1x Heap Doll

I found that maindeck extirpate was really good and unexpected by my opponents, which is one reason why I ran 3x Stifle and 1x Trickbind, also to protect from counter magic. I felt I should have had 1-2 more Duress main deck. I found out quickly during testing that this deck folds to CotV at 1 which is why ran Rushing River instead of CoV. Main deck Pith was quite effective, as was Aether Spellbomb.
My SB choice with Duplicant and Gilded Drake was for Oath matches and any reaninmater that could ahow up, Heap Doll was for Ichorid which is awesome, although I faced a bad dredge deck only once and never needed it.
Yawg. Will was the real champ in this deck, allowing me to have an awesome late game, whenever Will resolved I won as a result.
I lost to a mono-blue Fish/Standstill deck because the bounce and counter magic was too much.
The Trinket Mages and Bob's went the distance a few times if I could not resolve a Dreadnought.

Anyways I really enjoyed this deck and any suggestions to improve it would be great.