Big and many? Try f11 and 200 single frames
I think you did a great job cleaning up the file. Did you take the background from a single file ?
Thanks for look-seeing. I appreciate it.
I know there are much deeper stacks, but this is just a normal flower. I just wanted it in this particular way. Anyway, a stack of about 15 - 20 images stacks a bit easier, with (typically) less stacking errors, especially when the aperture is F8 or higher.
I use Zerene Stacker for my focus stacking, it offers the option to edit the stack by choosing which image to favour with the brush. So, in a way yes i did take the background from a single file, but not totally the same.
For some "real" focus stacking, check out the work of Michael Erlewine and Bob Friedman on this forum (if you hadn't already).