a couple of points. A lot of ESC's you can set the LVC so if it comes preset too low for your taste, just increase it. If you have an RTR type ESC that you can't program, you can always add a cheap battery alarm. I got some from Hobbyking and you set a voltage and they start beeping.

Not sure where you set your drone LVCs but the LVC is going to kick in on loaded voltage. So the resting voltage of the battery after LVC will typically be higher than the LVC setpoint. I would think you see that on the drones with your very high C-rates.