First of all A320 isn't a plane you normaly should be worried about when it comes
to tailstrike. Bigger bus models may have that ''problem'' but only when takeoff or landing at farely high speeds.
Flaps increase doesn't make that the chanses of tailstrike getting higher, just to increase
the lift coefficient - and thereby possible to land at lower speeds.
In this case when Flaps 3 landings are not so often used as Flaps full you may just keep a higher speed to not stall it. But of course airplanes at higher speeds is much moore controlable than the planes att low speeds, be careful to not overpull it.