Hi Slicepong,
Thanks, glad you enjoyed the video and found it helpful! I would say actually variation is the key when serving to be honest rather than any specific areas, being unpredictable. So unless someone has an obvious weakness returning from a certain area, try to vary your placement and length to keep them guessing.
The other factor to this is keeping the serve low, a good reverse serve if its low will not be easy to flick, most players actually find the reverse more difficult to flick than a normal pendulum or backsspin serve.
So keep variation and practice thats vital!
