-1 Fear Monger
+1 Dasher (free summon of a full ATK Barbaros, Cydrag, or Phantom Drag and not as situational as Fear Monger)
-1 Soldier of Mist Valley
+1 Gale (just overall a better synchro with a much better effect.
-1 Krebons
+1 Psychic Commander (gives you a bit of extra choice for E Tele)
Additionally, and this may be a bit of a big change to make with a build like this, but my personal DSD build runs 3 Barbaros and 2 Plasma, allowing me to also run 2 Trade-In. Just keep it in your mind, but you don't have do it that way. Now, on to your extra deck:
-1 Myst Wurm (you'll almost never summon him so he's worthless)
+1 Colossal Fighter (2 are good, especially if you think you're gonna see a lot of LS or BW)
+1 BW Armor Master (with the addition of Gale I made earlier)
+1 Chimeratech Fortress Dragon (never forget to run this, especially when you have a Cydrag already in your deck)
And for the side deck:
+1 Mirror of Oaths (no reason not to run 3)
+2 Light-Imprisoning Mirror (stops LS)
+2 Sirocco (for when you face BW)
+2 Waboku (for BW and LS)
+2 Pulling the Rug (in case of Monarchs)
+1 Royal Oppression