2H weapons vs 1H weapons + off hand [Warning: Math]

[RiotInferno]

I wrote this up for a wizard friend of mine, and I was hoping that you guys could double-check my logic / math.

Premise: In the case of DoTs (like Blizzard), a 2H weapon is superior due to having a huge minimum damage. I attempt to prove, through absurdity (not in the logical absurdity, but through best-case-possible absurdity), that this is false.

Part 1: Base Damage (not DPS) equation:
Damage per hit = (base weapon damage * skill damage ) * ( 1 + ( primary stat / 100 ) )
For this example, there's no "bonus" damage, but if there was (say, 5% against elites), it's multiplicative.

Part 2: Constants (APS do not matter)
Skill: Blizzard ( http://us.battle.net/d3/en/class/wizard/active/blizzard )

Best base 2H weapon:
Doom Hammer, 2H Mace ( http://us.battle.net/d3/en/item/doom-hammer )
Minimum Damage: 651 (APS: .9)

Best base 1H weapon:
Centurion Spear, 1H Spear ( http://us.battle.net/d3/en/item/centurion-spear )
Minimum Damage: 209 (APS: 1.2)

Weapon Mods:
Minimum Damage (Elemental): +286
Socketed Gem: +20
Minimum Raw Damage: +381
+% Damage: 50%
Intelligence: +101

These 4 mods are able to spawn on both types of weapons. Damage mods have no difference between 1H vs 2H. (some mods, like stun chance, have greater values on 2H weapons )

That brings our new totals to:
Hammer: 2007, 101 int
Spear: 1344, 101 int

Off Hand:
Demilich ( http://us.battle.net/d3/en/item/demi-lich )
+110 min damage.
+200 Int

or
Shield:
+200 Int

Updated Totals:
Hammer: 2007, 101 int
Spear / Lich: 1509, 301 int
Spear / Shield: 1344, 301 int

Plug into equation:
2H Hammer: ( 2007* 2.1 ) * ( 1 + ( 101 / 100 ) ) = 8471.547 Minimum Damage
1H Spear / Lich: ( 1509 * 2.1 ) * ( 1 + ( 301 / 100 ) ) = 12707.289 Minimum Damage
1H Spear/ Shield: ( 1344 * 2.1 ) * ( 1 + ( 301 / 100 ) ) = 11317.824 Minimum Damage

At the end of the day, losing the off-hand slot is costly in Base Damage and defense. That extra 200 Int goes a little way towards resistances, plus you're losing out on +Resist, Armor, and the ability to gain an extra 3s duration on Blizzard (orb affix).

Sources:
D3 MPQ data files,
http://d3inferno.com/affixes/ItemAffixes.html
http://us.battle.net/d3/en/item/
http://www.clicktoloot.com/p/combat.html#weapondamage