The default image is the one I originally posted at https://www.latentinsight.com/Images/helicon.jpg.

To clarify the process I used, here is a video of my processing that exact set of files, showing all of the preferences, etc. In the video I processed the files twice, the second time removing five ...

Interesting. My best results were by removing photos 7-11. The final results of the legs are blurry, since the removed images contain sharper renderings of the legs.

I've tried all methods (A, B, and C) with similar results.
Here are my settings:

Radius: 8
Smoothing: 4

Autoadjustments:
Adjust ...

I hadn't touched the settings, but I did reset everything anyway and am still getting the same anomalies around the fly's feet. I'm using the Mac version 8.3.2, which is apparently the newest one.

I just started to look at options for stacking, and I love the Helicon interface and usability. It's clean and fast, and super easy to use. Unfortunately, one of my first tests did not work so well, and it's somewhat of a deal breaker for me if this type of sequence can't be stacked well. Photoshop ...