[JCF]

Just keep moving around on it - you'll find the spot.

One thing that might help is put the board on a countertop or table (when the wife is out) and study the rocker (bottom curve - though on that board it will be fairly flat) and see where the thickest part of the board is.
That will give you a good idea of where the "float' is.
You can learn an awful lot about how a board will go by studying its shape.

Basically, to catch a wave you want your weight situated a little over the tipping point ( with your back arched) so that when you lower your torso the board tips down.

- if however you are just paddling around for position then slide just slightly behind the tipping point so the nose doesn't catch the chop as much.

Another trick, note where - I will even scratch a hole in the wax or put a sticker, where your nose is on the board when you lower your head to get a reference point.