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Ignoring the ghosting, I still donít understand your reasoning for focus stacking this particular shot. What did you want the main subject to be, or was this shot mainly just for practice? At least for me, the main subject should have been the lower right flower grouping. For focus staking to have been beneficial, I think the composition needs to be altered slightly, and the flowers to the right should have been much closer to camera then the ones on the left. This way you could have focused stacked the closest flowers without bringing in bits of focus from the other group. I agree with your reasoning for using a large aperture to blur out the background, but this idea should have also been applied to the left flower grouping to isolate your subject better.
Since you donít have much experience focus blending, I would suggest setting up a static subject indoors just to practice the technique, as well as the post processing side of things. These flowers on a long thin branch are very difficult to stack correctly, even with the lightest breeze. I would be surprised if many people could make a perfect stack of the same thing.
And as others have said, Photoshop does not do as good of a job compared to specialized focus stacking programs. If you use a PC, try CombineZM or CombineZP. They are both free and work great. If you want to get into serious stacking in the future, Helicon Focus or Zerene are the best and cost around 100-150$.
Keep practicing! It doesnt take long before you are capturing perfect +10 shot stacks in under a few seconds.