You need to use Waterline Rough with a small clearance to do the 'rough' shaping then a second Waterline Finish to do the final shaping. Rough will step down in increments, Finish will follow the full depth for each pass. To mill both directions change Milling direction to 'mixed'.
You will receive much faster responses to help requests if you use the CamBam support website. Probably the best help support I have experienced with any software package. You usually get answers very quickly. Few CamBam users follow this site.
Don