Elvaan SCH - HNM Nuking set?

Kaeko's always-awesome blog has an incredible Most recent post: Scholar Guide (Part IV), in which he discusses the possibility for a SCH to reach the sort of stats that make it viable for nuking on top tier HNM's. As an Elvaan I'm already facing an uphill battle, but being well-geared and well-merited, I've still been able to do respectable damage in many of our linkshell's Tiamat fights. Looking at my gear and stats:

A naked Elvaan SCH/RDM with 5/5 INT merits and 8/8 Elemental Magic merits has 69 INT and 272 Elemental Magic skill under Dark Arts. This is a brutal reality, considering that a Tarutaru SCH has the innate advantage of +13 INT (the little bastards start with 82). As a SCH/BLM I can pump this up to 71 INT (still 272 Elemental Skill), but for reasons that will be discussed in time, this is generally not worth it. As it stands my Elemental resist set consists of:

Main: HQ Staves
Sub: Bugard Leather Strap +1 (1 INT)
Ammo: Phantom Tathlum (2 INT)
Head: Elite Beret (4 Elemental)
Neck: Elemental Torque (7 Elemental)
Ear1: Moldavite Earring (5 MAB)
Ear2: Morion Earring +1 (2 INT)
Body: Scholar's Gown (15 Elemental, 1 INT)
Hands: Genie Gages (8 Elemental)
Ring1: Tamas Ring (5 INT)
Ring2: Omega Ring (3 INT, 3 M.Acc)
Back: Gleeman's Cape (5 INT)
Waist: Penitent's Rope (5 INT)
Legs: Mahatma Slops (8 INT)
Feet: Goliard Clogs (4 INT, 2 M.Acc)

Under Dark Arts, this gives me:

306 Elemental Skill
+5 Add'l Magic Accuracy
69+35=104 INT

Seeing as how M.Acc is treated as equivalent to elemental skill in terms of nuking an HNM, this is the equivalent of a 311/104 build, a far cry from the 320/120 talked about in terms of breaking through an HNM's magic defense.

The nice thing about SCH, and in particular having 5/5 Stormsurge merits, is that by eating a Cream Puff (+7 INT) and giving myself Hailstorm (+7 INT) I can pretty easily break through to the 120 INT barrier: this combo gives me 311/119; far from elite, but certainly respectable.

On mobs you can nuke with Ice, like Khimiara, it's a different story. The +5 INT and +10 Elemental skill of the Aquilo's staff is massive, taking me to a 321/124 build (w/cream puff and hailstorm). Utilization of Klimaform under Hailstorm just allows me to pile on.

As always, though, there's plenty of room for improvement:

On my head piece, replacing my elite beret with an elite beret +1 will give me 1 more skill, and an Argute Motherboard (SCH AF2 head) would give me +3 over my current setup (314/119).

A Merciful Cape (Ix'MNK drop) gives +5 elemental skill, but sacrifices 5 INT from my current Gleeman's Cape (316/114) (cumulative 319/114).

An Argute Belt (SCH AF2 Accessory) keeps the +5 INT of my Penitent's Rope and gives me +2 M.Acc to boot (313/119) (cumulative 321/114).

Replacing my Moldavite Earring with another +2 INT earring sacrifices MAB for another 2 INT, which would probably help on HNM's (311/121) (cumulative 321/116).

Replacing my Scholar's Gown with a Scholar's Gown +1 gives me +2 additional INT (311/123) (cumulative 321/118).

That's not horrible, but still not quite the 320/120 that's said to be required to nuke effectively @HNM's. Also, it's worth mentioning that I can drop a +2 INT earring for an Elemental Earring which takes me to 324/116, then trade out our Merciful Cape for our Gleeman's Cape, which gives us 319/121. Not horrible, but far from elite.

With a black mage sub, the 321/120 is possible, and /BLM may be superior as a pure nuker at Tiamat.