If you are seeing resists in bliz 4, use you elemental debuffs to lower the mobs INT and MND first. Then shoot off the nuke.
If I really must point out the obvious, then I shall. Please do not take offense to this. The elemental debuffs are exactly that, elemental. This means that they actually rely on Elemental Skill to land and work. It stands to reason, therefore, if I'm being resisted by the majority of my spells that I am also highly likely to be resisted casting these elemental debuffs. A resisted Burn is a waste of time I could spend casting a nuke instead.
As an addendum to this, I'm a tarutaru with merited INT using Cruor enhancements and Atma of the Minikin Monstrosity. My INT is very high, and is very noticeable in the damage when I land nukes unresisted. While I don't doubt that Sand Sweepers (thank you for the correction, by the way) have potentially greater INT I do not believe INT is as big a problem as Elemental Skill, which has a far more pronounced impact on casting spells when not up to par.
I'm not sure why your numbers are so low at level 80 when your skills aren't that far behind. At 75 I was able to azure kill no problem by timing my nukes and dropping 1.5~2k nukes. And this was before I had any atmas.
If I had the answer to that, I could give it to you. I do not. I will say, however, that my Thunder IV spells usually land for around 1k, and Burst II up to 1200 when resisted. Unresisted nukes on those hit for 1700~ for Thunder IV or 2100 Burst II. The 1k mark remains my average damage for Thunder IV though. Elemental Seal guarantees a hit for the full damage, naturally, which I usually use for Freeze II because of Atma of the Beyond for a total of 2700 damage. Resisted damage, with the same nuke, comes to 300-400. That's the 'average' by the way, using Aquilo's Staff.
Another member of my last team claimed they had 330 elemental skill and were still seeing resists consistently. Mine is currently at 324 with all enhancements considered. It should be at 332 (including AF gloves), so I still have another 8 levels of skill to gain.
If you are only getting 200~300 for bliz 4 then maybe you should let us know what you nuking gear set is, what atmas you are using, and what mobs you are fighting. And iirc you want to pile on the MAB and INT before the elemental skill because they are more beneficial ... again I don't know the exact comparisons off the top of my head.
Okay, here's my gear setup:
Main: HQ Elemental Staff (Aquilo's, Auster's etc)
Sub: Bugard Strap +1
Ammo: Morrion Tathlum
Neck: Artemis' Medal
Head: Teal Chapeau
Body: Teal Saio
Legs: Teal Slops
Feet: Wizard's Sabots (Yeah, they suck but so does most other gear at my level, and I like the 20% interrupt down and enmity)
Hands: Wizard's Gloves (For the elemental skill)
Rings: Aquilo's Ring x2 (Fire res down sucks, but you can't help love that INT)
Earring: Morion Earring + Moldavite Earring (Trying to replace Morion with Aquilo's, but they're rarely on sale)
Back: Prism Cape
Waist: Penitents Rope
I'm welcoming improvements to my gear, so feel free to point out any sticking points I might have with either resist rate or damage. I wasn't really trying to turn this into a debate, just trying to get advice on capping skills. I still fully intend to cap my skills so at least I'll be secure in the knowledge that there's less work to do later. Edit: Fixed wall of text Edited, Oct 21st 2011 1:10am by Glitterhands