If your goal is to hurt walls early on why not use swords dance? The only pokemon you listed that would run enough Spe EV's to beat you are Saur and Milo who, based on your calcs, feraligator isn't beating ayway. Now with +2 attack you get:
the 1hko on Registeel with leftovers (95.60%-112%) and on cloyster (88.82%-104.6%)
The chance of a 2HKO on milotic with lefties+sr is 60%
2HKO's are the same on Bro and Uxie. Altaria will be in trouble with sr on the field. Venusar is still up in the air as the amount of sets flying around is just silly but without a SE attack most waters wont be able to take it down anyway.
+2 lowkick gets the 2HKO on Omastar (utility set)
You also overlooked Tangrowth and Leafeon. You have no chance against monjobo even at +2 as a 100BP lowkick is only doing 30% and crunch is hitting leafeon for 46% (136HP adamant) and he outspeeds.
Ah I didn't type out what I meant to say in my head, which was break down the walls and the most common switch ins while still maintaining sweeping capanilites. Truth is it can't always be used at a designated point in the game. I can say now that it is most effective mid game.
With his crappy speed he really needs the speed boost to do anything.
At +2, Tangrowth is barely 2HKO'd by Ice punch so you lose in anycase.
With Sword dance instead of DD Leafeon outspeeds (and counters) you anyways along with a good portion of the tier.
Threats (that i can think of right now) to watch for with Waterfall, Low Kick, Crunch: Toxicroak, Torterra, Venusaur, Milotic, some Altaria.
Torterra, Toxicroak, and Altaria don't usually switch with because of threat from IP and EQ from the normal DD set. Venusaur's are sometimes OHKO'd by IP sometime not, the EV spreads are so varied at the moment so thats such a toss up that IMO it's not worth it staying in unless they are below below 50%.
Tangrowth, Leafeon, Poliwrath are NU counters which you won't be getting by soon anyways.
Milotic aside, offensive and defensive Moltres do well against all the rest of the walls that get in the way. Altaria and Weezing are good switch ins to those that force you out although Moltres and Altaria need to be careful of Stone Edges from Torterra and Weezing needs to watch for NP Toxicroak.
I'm sure at this point you have figured out what to do when Milotic shows its face on the field.
This would be really easy to slash with the standard DD set.