I forgot to mention, that with the help of the Rangs, I may have succeeded in zeroing in on when the legs sink. When I start the lap, I push off the wall into a superman glide before I start my strokes. I glide about 5 yards or so and my legs do not sink. With my face still in the water and looking directly below me, I do two strokes, my legs don't sink. Then I take a breath and put face back into the water which is when I can feel my legs sink a little. Then I begin to make adjustments to streamline my body, bring my feet back up over the next two strokes with my face still in water.
I need to video my stroke so I can post here for suggestions. I think it may be the way I turn to breath in and put my face back in the water. The mechanics may be wrong throwing my body off balance.