[Deck] ANT (Ad Nauseam Tendrils)

[GoblinZ]

I'm prepping my final decklist for the GP Saturday and I'm still on the fence about a few things, interested in some additional opinions. Here's my decklist for reference.

4 Brainstorm
4 Ponder
4 Gitaxian Probe
3 Preordain

4 Dark Ritual
4 Cabal Ritual
4 Lion's Eye Diamond
4 Lotus Petal

4 Cabal Therapy
2 Duress

4 Infernal Tutor
1 Grim Tutor
1 Ad Nauseam
1 Past in Flames
1 Tendrils of Agony

4 Polluted Delta
4 Scalding Tarn
2 Underground Sea
1 Volcanic Island
1 Tropical Island
1 Gemstone Mine
1 Island
1 Swamp

Sideboard

3 Xantid Swarm
3 Abrupt Decay
2 Dread of Night
2 Massacre
2 Carpet of Flowers
2 Chain of Vapor
1 Sensei's Divining Top

Questions

1) What are people's thoughts on the correct maindeck discard suite? I'm playing 6 discard spells main, preferring the 3rd Preordain to the 7th discard, which may be wrong, but I've always played 4 Cabal Therapy and only 2 Duress, instead of the other way around. I like being able to hit Thalias and multiple copies of Force of Will, and I feel like I'm good enough at reading my opponents that I hit fairly often with Therapy. Am I overstating the number of times Therapy is good? Should I be playing more Duress?
2) Just how necessary is Carpet of Flowers in the board? At this point the only thing I'm bringing it in against is Delver. It's sometimes hard to find space for it against UWR because I have to bring in hate for Meddling Mage and keep in all of the discard. Against RUG it's an easy swap, and against BUG it's gets abrupt decayed as often as it sticks around and is awesome. I haven't tested the RUG matchup much without it, though, and it seems fairly important. I'd love to find room in the board for a 2nd top and a 7th discard spell though, so if I can live without carpet, it seems nice.
3) How is the Death and Taxes matchup going for people now that 4 Phyrexian Revoker is the norm? I did a lot of testing this weekend, and both Massacre and Dread of Night had games where they were awesome and irrelevant. I tested with 4 Dread of Night and lost a game with 2 Dreads out to 3 Phyrexian Revokers beating down, blanking all of my artifact mana. I tested with 2 Massacre 2 Dread and lost games where I had Massacre but they kept a vial on 2 and just vialed Canonist or Thalia in after I Massacred. At this point I'm feeling good about the 2 Massacre 2 Dread plan, which lets me lock out all thalias but still gives me good answers to canonist and revoker in the deck. I'm boarding -2 Duress -2 Cabal Therapy -1 Probe for +2 Massacre +2 Dread +1 Chain of Vapor and that seems to be OK.
4) Followup to question 3: Is boarding extra Ad Nauseams instead of Massacre a viable strategy against D&T? Trying to go off before they can put down the lock pieces instead of trying to deal with them all seems like a perfectly good way to win. I'd still keep the Chain and 2 Dread of Nights, but otherwise I'd have a faster way to win that's also a valid sideboard card against Sneak and Show and TES.

I definitely appreciate any thoughts. I'm stoked for this tournament. I have 2 byes ready to go and I'm ready to count to 10 all day.

My list is very similar as yours. based on my experience, 14 cantrips and 5 tutors are good enough for consistency and speed. I prefer 4 therapy 3 duress in the main, 4 therapy imo is a must right now.

I am not sure about the dnt mu either for I have few chances to test this. I plan to play 3 massacre. Maybe boarding some removal and massacre on the draw, race them on the play.