Its your shocks. FLEX-Z are a relatively cheap twin tube with a lot less bump travel than OEM. Turned up stiff enough to avoid wallowing and they'll bounce due to inadequate low speed rebound. Turned down to avoid bouncing.. and it wallows.
Make sure you have lengths adjusted so you're staying off the bumpstops. Raising the car will likely reduce the bouncing.
Swaybars are not the source of the oscillation and have nothing to do with it so ignore that.
Any adjustable shocks should always be set to the softest possible setting that controls wallow. No stiffer than that. Poorly designed shocks will often start to bounce before the wallow goes away so you can never find the right setting.
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