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
HGs: Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; DM MiraCurls Curling Gelly; UFD Curly Magic; Shescentit LIs; Sevi conditioners; Botanical Spirits Puree, CJ Repair Me