Optimal EVs for Mamoswine VGC Hyperoffense

I've been testing this Mamoswine team and am getting good results. ATM am pondering what EV's would be optimal to face popular mons.
RN I just run most of them with max offense and either max HP or Speed. (Also the Delphox feels a bit awkward from time to time so any suggestions for replacements are welcome)

**So I am wondering: **
- If there are any speed thresholds I should aim for.
- If there are any attack thresholds I should aim for.
- Any suggestion to struggle less into Rotom wash.

**Basic ideas behind the team: **
- Aerodactil for tailwind + Rock slide
- Mamoswine with Earthquake spread (+ Prio ice vs garchomp, and Heavy slam vs Floette)
- Sneasler as fast fake out (To set up tailwind more reliably and chip mons into earthquake range)
- Delphox as fast spread damage in case Mamoswine has a bad machup, or fast Will O wisp support
- Hawlucha cuz its my fave mon (Also has Entrainment for the Vanilluxe/Aero/Delphox
- Vaniluxe with Sheer Cold + Huge power (So 1 speed point below max speed Hawlucha). Or Fast Blizzard cleanup against weather teams.
(Also boosts Mamoswine's defense)