IMHO, cut is the foundation for great hair. I understand that Deva cuts are supposed to last longer. The fact that your ends are tangling is one indicator that it's time for a cut, especially since it's not typical for you. I suspect a good cut will cure a lot of your issues.
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08

SE PA

HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic (now Hello Curly Curl Stimulater); Botanical Spirits Jellies, CJ Repair Me, Aloe Fix and CCCC