[shrang]

Here's what I think the first set should look like:

[SET]
name: Physical Attacker
move 1: Icicle Crash
move 2: Ice Shard
move 3: Earthquake
move 4: Superpower / Stealth Rock
item: Life Orb / Choice Band
ability: Thick Fat
nature: Jolly / Adamant
evs: 252 Atk / 4 Def / 252 Spe

LO and CB Mamoswine play similarly enough to be merged, IMO. Getting locked into Earthquake sucks, but practically no EQ immune/resist apart from Skarm and Rotom-W would like to switch into Icicle Crash anyway.

Another thing to consider is Scarf Mamoswine. It may seem weird, but Mamoswine has the coverage and relatively good speed to revenge kill most threats it's supposed to revenge kill anyway. Something like this:

[SET]
name: Choice Scarf
move 1: Icicle Spear / Icicle Crash
move 2: Earthquake
move 3: Superpower
move 4: Ice Shard / Stone Edge
item: Choice Scarf
ability: Thick Fat
nature: Jolly / Adamant
evs: 252 Atk / 4 Def / 252 Spe

Icicle Spear lets you kill Dragonite through Multiscale, but Icicle Crash is generally more consistent. Ice Shard may seem out of place in the last slot, but it's still reliable priority if you ever need it, and it's not like Mamoswine is really starved for moveslots.