I registered to post this....
Get FoF, get shatter.
Spell rotation is as follows (does not include throwing in the fireball when it procs)
Frostbolt---this procs FoF
Frostbolt (consumes 1 charge of FoF)
Frostbolt + Immediately spam 1 ice lance. (these 2 hit at the same time, both affected by FoF, consuming the last 1 charge)
Ice lance is faster in flight than frostbolt, therefore if you cast frostbolt and immediately follow it up with an ice lance they will hit at the same time.
Giving you 3 spells affected by FoF which only has 2 charges.
Good game.