I added those matchups. I'm not really sure about Grixis Delver though, as I have not had much opportunity to play against it.
I'm glad that you're enjoying the deck. It definitely rewards practice. I've been playing something very close to this list for over three years, and I'm still discovering new lines.
As far as green mana goes, here's my reasoning: All of the maindeck green spells are, at their core, just support for the colorless lands. Every Forest you play after the first has drastically diminishing value, as those are land drops you could be spending developing the mana you really need to cast your business spells or that you could be spending to answer your opponent's threats. Consequently, every Forest you draw after the first has diminished value as well, as the deck can't shuffle them away with Brainstorm. Additional Forests also clog your five from Ancient Stirrings. So I see the Forest count as something analagous to the land count in RUG Delver - you run a bit light in order to draw more gas.
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