How did you feel about the Oath board? Did you miss having more slots available for other matchups, or did you find that the Oath plan was just what was needed against decks that the mainboard didn't trounce?
Only against other storm decks without Force of Will (especially a mirror), did I want additional sideboard slots. (since pact of negation is basicly a dead card) Boarding orchards against oath is fun since it will most likely trump their "second best" godhand (the first one being lotus, key, vault) which is almost their only chance of winning this matchup.
The oathpackage was awesome against workshop, but only for one event I think. (the chance of having the element of suprise with it in future events has decreased somewhat)
I notices you ran only 11 land. Do you feel this was the right number, or did you miss an extra land or two at any point?
Yes i did miss out on land drops in one or 2 occations, my idea of playing so few lands was that Preordain almost counts as half a land/mana since it will most like find mana when you need it. (I can almost garantue you that no one will counter a preordain, unlike brainstorm)
How often was Pact useful and how often do you think it would have been better as Thoughtseize?
I didn't count, but my idea behind it was: thoughtseize/duress is best when you want to win turn 2/3, where pact of negation is better if you want to win turn 1/2.

Pact is obviously bad/weaker against shops, but I could board a lot in that matchup, so that counts for something as well.
did you run 3 10drils specifically so that with the Robot you coudl dodge Cap effects, or was there another reason? In testing recently, I've found that 3 is too many in the maindeck as I always end up with extra that would better serve me as something else. What do you think of two?
Yes, my standard for any combo deck is that it must have at least 4 kill conditions after sideboarding in the shop and combo matchups. 3 Tendrill's main seems like the right number. (one tendrill's in the opening hand can easily be pitched to chrome mox, or make a turn 1 or 2 Ad Nauseum 95% lethal since you will "only" need to hit mana cards at that point. Sometimes you can randomly win turn 3/4 (with you opponent sitting on a pair of counters) using chain of vapor to create a nice storm count (not many players will counter a chain of vapor when you are holding 2 or more cards in your hand), sometimes even netting some mana in the process)