I know when to use LB, thanks

[JTribal]

99% of the time, if a non-dps tells you to "LB!!!!!!" (and it is ALWAYS tanks or healers telling the dps to) you will either be dead (e.g. Titan landslide while in the LB animation) or the target will disappear before the damage gets applied (e.g. Siren, Garuda) or the timing is not correct to skip a phase (e.g. Brayflox HM).

I highly doubt you are running those same bosses "99%" of the time.

Chances are, if someone is asking you to use it, you should have already used it at that point.