Hey man nice hail team i am quite a fan of hail myself
Ok seeing as this team is quite solid there isn't really to much i had in mind that could be changed. I was going to suggest a change i ev spread then looking over the comments New World Order beat me to it. 252 Hp / 220 Def / 36 Spe>252 Hp / 252 Hp / 236 Def / 20 Spd Helps you with Cloyster and base 70s like New World Order said the notable one being Breloom who you must outspeed so it can't Spore you. You barely lose anything in physical bulk either with the change in the ev spread.
Also if Volcarona is really a probelm for this team you may want to try Quick Attack>Pursuit The Latis aren't to much of a threat to your team as the proirity Ice Shard that Mamoswine and Abomasnow will help with them. Although it can be a bit annoying to not be able to trap Starmie. Both moves have there merits it's up to you if Volcarona is hard to handle or not because Quick Attack can ko it once it has gotten some proir damage.
Good luck with the team i hope i helped!