Regarding Formulas

I have been farming the Agh'kuk Warriors and Gatherers in search of armour formulas so I can craft some decent armour for my mage. So Far I've gotten a lot of spell formulas but no armour one's that I've seen. Could someone confirm that they do drop these,or have I been farming the wrong mob? I know that they have a big pool of available drops,I just need to know if what I seek is in that pool.

Try different mobs.

I would suggest trying the mobs in the Dead pool, assuming you are after beginner formulas (T1/T2). Beyond those for tier 3, the WA on Trandalar seem like a good bet.