I think with Ancestral, FoF, Stroke, Twister, Impulse, Demonic, Vampiric, Mystical and the two cycling Fire/Ice, you rather need more punch in the creature-kill department than with draw capability because your drawing power is -for the moment- high enough.
As much as I like Sylvan for being the ultimate top-deck machine, let's look at your creature kill: 2 Disks, Edict, Abyss, 2 Fire/Ice, Torch. Apart from the Disks which are very slow, you have no real "panic button", nothing you could throw between you and the Horde in a pinch. At the moment you have Factories, but as you progress to get everything together, you'll see that a 5-color mana base does not really allow for that many Factories. Balance fills the gap. Plus, you have *no* enchantment removal, so D-Blow does a great deal for you.

So, I'd recommend to add white to your main deck first to get the benefits of having enchantment kill and Balance. Secondly I'd also recommend that you take out the remaining Counterspells for Merchant Scroll and Zuran Orb (as you propose) to compensate for the lack of Sylvan with another searcher and to add the capability to survive that one critical turn after which you can take control.

If eight counters (as they often do) prove too few, you can throw in another one for that special occasions: either Misdirection or Teferi's Response as long as you play with three Factories. To make room, I'd take the Torch out, because playing an X-damage spell without the Moxen does not make sense to me, despite Mana Drains available. You have better uses for that Drain mana (Stroke, Morphling, Disk, FoF, Will). And winning should not be the problem with two Morphlings and three Factories (as long as you have those).

I wish you success in building a completely black-bordered 5-C-control deck! I am striving to do so myself, and I have almost completed it apart from my fourth City of Brass and my Mind Twist. (And of course, my Power has to transform miraculously from CE to Alpha...)

Dozer