So at what strength does it begin to plateau?
I hear 300, but takes major effect by 350ish. If you are to rebirth, try it, going up by 5 Strength each time instead of typing it in..
What sucks is, Vitality, or Focus, or Dex, that is mainly used by all other classes, never has less affect. Confused as to why not.. It limits a Rogues effectiveness, and doesn't really give rogues a choice of build.
Well dex is used by every class the same way a rogue would and the only classes that use focus in huge amounts are mages and druids who use it to strength their spells, not add more energy. And the thing is, focus also plateaus its spell effects at around the same area. And vitality could be used by rogues the same way as any other class and should not be used as an arguement because there is a price to pay for it such as reduced dps. You should see this as a good thing!
Now there is a reason to use your frozen meteoric and add more dex which I have read you would like to do!

The outlines and main stats used by classes should be (please note. SHOULD, as they are intended, do not have to be -
Rogue - Strength, Dex in 2nd, Vit 3rd, Focus 4th
Ranger - Dexterity, Str in 2nd, Vit 3rd, Focus 4th
Mage - Focus, Vit 2nd, Dex 3rd, Str 4th
Druid - Focus, Vit 2nd, Dex 3rd, Str 4th
Warrior - Vitality, Dex 2nd, Str 3rd, Focus 4th
I use my Frozen Meteoric anyway as it signifies the effort I've gone through to get it. However, it adds Attack, and ENERGY (WTF), not Defence, so nawh.. I still gotta use dexterity. Also I do not wanna use more dex because it doesn't help dodge skill hits to my knowledge, so is not worth using.
Also problem with Rogues Zodiac / Frozen, is that whilst it adds Energy and Attack.. None of these are even relative to the main Rogue stat.. Strength. Mages get +10 ice damage on Frozen Robe.. Rogues should get +10 Pierce, Attack, and maybe Defence. (NOT Energy).
Maybe that's where the un-balancing has come from in PvP.. The armour, boosts from armour etc all contribute, but if a Rogues strength stops at 300.. A warrior can just go 300 strength too.. A warrior will hit more because the rogue has worst armour, and the warrior already gets health boosts from his armour.