Alright, here's my suggestions:
-2 Pot of Duality (The deck special summons quite a lot, this can slow you down)
-2 Upstart Goblin (Supply Squad is better because it creates constant advantage)
-2 Kagetokage (while waiting for Petit Dragon, better use x3 copies of each Familiars for now, because all of them have 1500 ATK and 200 DEF and can be searched by Jigobyte)
-1 Soul Charge (in this deck, all the monsters you can special summon with this card have no effect/unable to generate advantage, not to mention you can't enter Battle Phase and taking LP damage, most of time you'll use this for just instant Xyz Summoning a monster, which is not that great considering the drawback it gives)
+1 Jigobyte (it's a searcher that you can suicide while Unleashed is on the field, allowing you to summon another familiar and a Charmer from your deck, not to mention it's searchable by King of the Feral Imps, so 3 is mandatory)
+1 Archfiend Eater
+1 Inari Fire
+1 Mystical Space Typhoon
+1 Bottomless Trap Hole (will help you a lot)
+2 Supply Squad (helps with card advantage, and can be triggered by Archfiend Eater. You get even more plus if you have it along with Unleashed)
Extra Deck:
-1 Vylon Disigma (too hard to summon, and its effect is outclassed by Castel/Silent Honor ARK, a single Ouroboros is already enough)
+1 King of the Feral Imps (staple for Xyz Charmer Deck, because it gives instant plus in form of Jigobyte)
Things that can be considered:
- Fiendish Chain (from my experience, for this deck it's more often better than Breakthrough Skill since it can stop an attack, which is really relevant since you'll experience times when you don't want your monster destroyed by battle because you only have 1 monster on the field, and in next turn you need to summon another monster to do Xyz)
- Forbidden Lance (versatile card that helps you deal with your opponent's backrow as soon as you draw it, it can function similar like Shrink,meaning it's another way to help your monster survive when you need it, in which Wiretap can't do)
- Torrential Tribute (can trigger Jigobyte, Inari Fire, and Familiars Unleashed)
- Diamond Dire Wolf (while Familiars Unleashed is on the field, use its effect to destroy Archfiend Eater (or itself) to get plus)
- Daigusto Emeral (another instant plus card besides King of the Feral Imps)
That's all I can think for now. Hope that helps.