Hi,
Fiveby, I see what you mean. Starting with an Sphere and then simply start sculpting with the tweak tool.
And have the advantage that puts the planes where they must be! 
About the star on Tool > Preview, you are right as well, I was loading the PolySphere that is why always you get a star there!
It would be better if ZB put a copy of your loaded tool, less confusing! 
What stills surprise me, it is that problem if you load the PolySPhere, reduce it number of polys so it is more manageable, when you execute the macro, the planes appear on a different size and the reduced sphere it is not on the center, so if you try to use symmetry is impossible. I think I discovered a bug here with that process! 
Only to clarify, your way works perfectly.
Best regards,
David