Oh, one other trick that I read about BRD re:Feint is that your only instant cast skill is a proc'd Straight Shot afaik, and you can only double-weave if the cast is instant. Because of this, casting BL procs is tough when your gcd is so tight and you only get one skill per gcd.

So: If you do NOT have a Straighter Shot proc, BL is off-cooldown randomly, another ogcd is also ready for the next gcd, and Heavy Shot is next, you can Feint>BL>ogcd>continue for a net gain of dps over holding either of the ogcd skills an additional gcd.

You just really really gotta practice finding spots to turret and then moving only when absolutely necessary and never any other time. Or at least moving smartly. Check out on fflogs how other Bards who are doing well handle the movement-heavy mechanics fights of A6S.