Ok, say I want whirlwind attack. I take a 14 in dex, and get all the feats to get to whirlwind. I then get whirlwind attack. Some time after, my mage casts enlarge person on me, making my dex go down to 12. Can I still use whirlwind attack? What about if I was peramaently enlarged? (through the original Dragon Disciple or some other means).