If CotV is non-prevalent in your meta, then 3-4 Chain of Vapors would generally suffice.
Otherwise, you need to throw in at least a lone Hurkyl's Recall in the mix.
Note that experienced Shop players will slap a CotV set to 1 into play the earliest possible time against combo (or to 0 if they're going first) and that will greatly retard your going-off turn.
Facing CotV at 0 is winnable; it's a whole lot of different story when it's set to 1.
I am not a fond of relying on draw 7's in ANT since it suddenly causes the deck to be more of a GrimLong/ANT hybrid.
This is evident in your "longing" to run Mind's Desire and your cutting of an Ad Nauseam.
IMHO, ANT is not a Yawgmoth's Will deck.
It may run Yawgmoth's Win, but the whole idea of running bomb after bomb that ultimately culminates into a lethal Tendrils is not its agenda.
It functions similar to Flash, in that you only need to resolve one card (Ad Nauseam), then your chances of winning suddenly sky rockets upon its resolution.
This is much apparent in the original Meandeck skeleton: it's focus is to make AN resolve the earliest possible time. No cute tricks. No draw 7 route. Just plain force AN and win.
I do run a lone draw 7 in my build, Timetwister, not as a fuel but as a "last restort" or a "reset button" especially when my opponent has already chipped off a lot of life from my total. (It's also great against Ichorid, which is darn prevalent in my meta)
I think if you continue to cut AN's and add Long cards, the deck will lose its focus and will play like an inferior Long deck that runs a less potent AN.
My 2 cents.
