Xalmat

For Ro:

Ro's Fury + Incinerate for me. Ro's Fury lasts a full 10 minutes and will boost your DPS quite a bit over the course of a fight, more than Inferno's Glory will.

Incinerate is a good finisher move (Pair it with anything you can to max it's damage: Dispatch, Najena's Ring, Trak Belt, Base Damage procs from your gear, etc etc).

For Anashti:

Hand of Death or Power from Beyond + Undying Favor.

Hand of Death is basically Ro's Fury, but 100% proc rate instead of 40%, and for less damage. Power from Beyond is 10% more spell/CA damage, but I'm not sure if it's Base Damage or +Spell Damage mod.

Undying Favor increases Crit Chance by 25% and Spell Double Attack by 33% for 25 seconds. If you can get a spell double attack off on our biggest hits (Earthquake, Master Strike, Bewilderment, maybe Ice Storm) that's a potentially huge damage boost for that short period of time. Also Spell Double Attack isn't too shabby for Crystal Blast, Winds of Velious, or Solidify (it's practically worthless for Fiery Annihilation, Vampire Bats, Shattered Earth).

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No amount of class adjustments will ever cure bad player syndrome.