I also run a Kinetic / Balance hybrid spec. It is very very strong in PvP tbh. My only problem with this build is getting the Mind crush buff thing to proc often enough. Listen to what previous poster said and ensure you stack PvP gear. Also before you buy champion pieces, pay attention to which slots have the +crit chance on them and which slots dont. Put stalker in all slots that have + crit chance in em. Then I use 2 slots for survivor gear..I love using Spinning kick ;p . One concern I do have is PvE in this spec. I am not sure If I am an effective enough dps, or tank...so getting any FP groups has been hard for me so far. Also please keep in mind when getting Champ PvP gear...that you can take out some of those modifications...the expertise stays on the gear, just for those that might want to play around with the stats on the PvP gear abit more.
EDIT: I do not spec into Containment in balance tree. I spec into Mind Ward. When i am in warzones...i see huge Dots on me alot of time, so this keeps me alive longer until i can clear them away with resilience.