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(zBrush Beginner) My Dynamesh-Resolution at my Model no want more go higher!

Hi Folks
I’m more zBrush Beginner.
My current problem is the Dynamesh-Resolution that not more want go higher.
I’ve female Model modeled, and i’m not finish. I’ve modeled in Dynamesh.
I’ve create She step by Step of Dynamesh Resolution (to go Step by Step higher in Details). But now i are in the Resolution 640 with 1934Million ActivePoints.
But when i now set the Resolution from 640 to for example 720, and i click [add] Button, Dynamesh not want work and go higher in the ActivePoints, why??? Also when i want go down with the Resolution, Dynamesh not want!! I’m going crazy…

PS. If i test the [Divide] than the ActivePoints go higher, but when i test than again the Dynamesh Resolution, higher or deeper, he dont want work. Why?

http://www.zbrushcentral.com/showthread.php?164782-Dynamesh-seems-great-So-why-use-ZSpheres-or-Edge-Loops-Also-max-polys-Answered&p=916495&viewfull=1#post916495

Ouuh… Thanks for the reply.