Actually I have found that Xantid swarm works really well in this deck as protection against disruption.they trigger gimps of nature and can be clamped.

Tinder wall has worked like a charm, it produces mana and works with your draw-spells.

I am not sure of the correct ratio of walls/swarms. The walls are great for scullclamping away, and make the deck more consistent goldfish-wise, but the swarms are the only thing aside from the speed (useless against FoW of course) that will give you a chance against an active opponent.  I am unable to find room for all 8 creatures beyond the kobolds. (Although at least 4 extra seems to be necessary)

I tried playing with duress, and duress was inadequate. The lack of synergy with the plan of gimpsing and clamping makes the swarm much better than the sorceries. Also, if you do go off , the duresses/therapies are dead draws, whereas the swarms will somewhat fuel the combo.

I play with power and dark rituals for acceleration, I haven't tried culling the weak, and I don't think it would be a good idea; having a draw-spell like gimps or clamp in your opening hand is extremely important along with a creature to trigger it, and there really isn't enough space for that many mana-only cards. In addition, the cost of sacrificing a creature is harder on the list I use because i only have walls that don't die to being clamped once.

Some of you want to add more blue, but the important cards are black, like YawgWin, tutors, bargain and rituals, finding the mana for tendrils is really important, while making the storm count is actually a piece of cake.  I have actually kept blue so I can keep Ancestral, but Ii am considering adding the 4th Xantid.