IF you fly your F4U-1 or -1A and fly it within its flight envelope, you should not have any major problems when using the Drop Tank....
I recommend flying with 75% & 1 DT or 50% and 1 DT rather than 100% fuel......
if the fuel is down at the field you take off from, use 75%..and burn wing tanks down first.
as Saxman has mentioned, sometimes it is a good idea to leave a little in each wing tank incase your main gets hit, or to use to RTB.
I prefer to drain both wing tanks bone dry myself..have always done that and is what I am accustomed to.....
the very minut drag of the pylons is worth taking the DT in my opinion verses flying with out one.......
using your plane how it is meant to be flown the Pylon rack is of no difference in my opinion what is a smidget of a few mph that you will only be at once you are FLAT OUT TOP SPEED... you will exceed this speed in dives and will not notice it at all when accelerating and maneuvering....