Ok I'll see what to do about this without replacing any of your pokemon though I highly reccomend a froslass to counter fighting types.
Abomasnow
I'd probably sacrifice some attack evs and give it to his special attack. Make him relaxed (+def-spe) so he can take physical hits. Blizzard with STAB is more powerful than a super effective brick break so its useless to have it on there. Instead, give it ice shard so that you can get an easy finish on a focus sasher and ignore that low speed stat.
Cloyster
This thing walls walls with its amazing defense. Your wasting evs by spending it on that low special defense as it still can easily be OHKO'd by a special attack. My recommended set is 252 atk 252 def 4 HP so he can wall. It's ok to keep blizzard for physical walls that would wall your icicle crash. Return isn't a good option so put in surf for some STAB. Shell smash honestly isn't that good on this guy. I'd replace for rock blast to get coverage.
Kyurem-B
There is a reason this guy isn't in Ubers, his lack of a reliable physical ice move. Freeze shock is bad for him and you will have to go mixed. 128 atk 128 spa 252 spe is my reccomend ex spread. Replace freeze shock with blizzard. Kyurem is to be scarfed to outspeed and hit hard with its attack. Since your scarfed replace roost with stone edge. Naughty or lonely so you can sweep.
Regice
If cloyster is your physical wall, this guy is you special. Having ice beam and blizzard is stupid. Replace I-beam with toxic to stall. I'd prefer focus blast over hidden power but both are good.
Vanilluxe
Once again replace ice beam with automatize to double this guys speed . Also this guy is a good pokemon to replace for the froslass I recommended.
Mamoswine
I like it except give it an l-orb and replace protect with ice shard.
