losing CP on tab kick and tab blind etc sucks, but is the reality of this patch. You can avoid it with mouse over macros but realistically this isn't very useful in PvP
As for spec, the 21/3/27 linked here multiple times is best (even regardless of gear level IMO). It has more control and survivability than any dagger spec, and eviscerates do very nice dmg
However you'll need to be combat daggers or combat swords to get a raid spot in a PvE guild. Daggers and swords pretty similar DPS at this gear level, but swords will pass daggers once BWL is out.
Another thing I'll say is that, between the 2 PvE specs mentioned above, Combat dags is somewhat playable in PvP but combat swords is totally AIDs