I like the one or two ant shots over the group -cool since it looks like the single ant is looking at its own reflection 
The slightest little smudge on the mirror will change that area's reflectivity, and if you were using focus stacking software it may have gotten confused in the areas where the reflection is the worst (nothing to key off of). Those are my best two guesses for the streaking in the images.
Since you've got full control over your "studio" why not stop down a little, look for a magic angle, and take a single image. Might help you to figure out where the streaking is coming from. A third possibility that just popped into my head -maybe the lens was too open?...