Pendulum & "Centrifugal" Force

[MedPR]

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Below is a graph of a pendulum in SHM. The force represents the Centrifugal (equal and opposite to Centripetal) Force. My question is, what do the peaks and troughs represent in terms of the pendulum's path? Which one (peak or trough) is the equilibrium position (h=L)?

 

[chiddler]

When it is at equilibrium, tension in the string is greatest therefore equilibrium positions are when the force peaks.

mgcos(theta) if i remember correctly is force down by centripetal? so when cos=1 is theta = 0