How do you determine with accuracy what "tanks need more"? Do you mean the tank for that encounter? All tanks? Only plate tanks? What if the tank dies and a good Monk finishes tanking the encounter? Does that Monk get put into the "tank loot privelege" system for that encounter? Why are tanks the most important role in your system?
No one has complained so far? That must mean you have not seen this drop yet:
https://everquest.allakhazam.com/db/item.html?item=17722 Read through the friendly discussion there about NBG.
Why did you post this?
This all seems very arbitrary.
And how do you pass down raid items that are 99% no drop?
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After 16 years, I'm not listing every friggin character.