The Landlock is a slow "cadillac" of a board. You might be able to ride tandem with your small child or small wife/girlfriend, but any significant amount of air is not going to happen on the wake behind a boat.
With your height/weight, you'll probably want to look at some of the following:
Inland Surfer Blue Lake (or Yellow Loogey but with your height/stance it might feel a little short)
Walker Project 5.0 Comp
Shred Stixx Pirahna (or Thresher if you are ambitious)
Walzer Alpha LG
I'm sure you'll get some more detailed suggestions/opinions from the forum, but this will get you started as you begin your search for the right board for you. You can find a bunch of these boards along with reviews at www.wakeoutlaws.com