There was a similar question posted on this topic previously where it was agreed that the deflection of a rotating blade was decreased once the blade began rotating due to the centrifugal force. But I don't see why centripetal force can't also counteract blade deflection.
If we have a blade that is attached to the centre of rotation at a joint/hinge then when stationary the blade will naturally deflect downwards due to the mass of the blade. For simplicity I assumed that the load due to the mass of the blade is acting downwards at the very end of the blade. Due to this deflection there is some tension in the blade. The vertical component of the tension would be equal to the weight of the blade while the horizontal component of the tension would be the centripetal force. Now, as the angular velocity of the blade increases the centripetal force (Horizontal Component) will also increase in magnitude however the vertical component of the tension will remain constant. As a result, the angle at which the tension is acting act relative to the horizontal will decrease. Since the tension is supplied through the blades the angle of the blades relative to the horizontal must also decrease and hence the deflection must also decrease.