Chassis flex also contributes to unpredictable cornering. This is the biggest (and hardest to correct) concern with a pan-based TD: all the stiffening properties of the old Bug body are gone.
Late to the party, I know, but eliminating the chassis flex isn’t that tough. Well, maybe it is if you’ve already put your car together.
Welding square tubing into the channel at the sides of the VW pan will replace a lot of the stiffness previously supplied by the steel body. (Convertibles already have the channel filled.)