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I did some research and fertilizer can negatively affect insects. For example, excess nitrogen can cause insects to ingest nitrates, and too much can be harmful.

When putting your fertilizer in the sprinkler system are you able to monitor how much each plant is getting? Too much fertilizer isn't good for plants, either. It might be just as easy to drop some slow release fertilizer around each plant.

I did a little research on vermiculite, and I would stick with the mud or sand. Butterflies puddle not only for moisture but to sip nutrients. While there are nutrients in vermiculite, I couldn't find research that indicated they would be the same nutrients butterflies need. Plus, there is a small chance of vermiculite containing asbestos.

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/vermiculite-growing-medium.htm

http://www.umt.edu/bioethics/libbyhealth/docs/online_resources/usepa_fact_sheet.pdf

As a gardening information website, this may be a bit beyond our reach, however, I did find that this predator has been studied here in Oregon at OSU. You may have some luck finding someone there, based on this dissertation I found online:
Biological control of spider mites by the predatory mite: https://ir.library.oregonstate.edu › downloads.

You may also be able to find this info from a university extension agent; they should be able to pin this down for you.
https://www.gardeningknowhow.com/extension-search

First-

Please DO NOT post your personal information to the public. This is very unsafe. I have removed it, this time.

Now, attracting owls will likely require a space for them to roost. This will need to be more than the ledge, so an owl box is recommended.

https://www.gardeningknowhow.com/garden-how-to/beneficial/creating-owl-boxes.htm

This article will help you to attract owls to your area:

https://www.gardeningknowhow.com/garden-how-to/beneficial/attracting-owls-to-garden.htm

Here is an article to help you to attract other birds of prey, should your owl endeavor be unfruitful:

https://www.gardeningknowhow.com/garden-how-to/beneficial/attracting-birds-of-prey.htm

Yes, cut off the stem and move it to a bush in a protected area if you can. That will help it survive the winter.

https://www.gardeningknowhow.com/garden-how-to/beneficial/praying-mantis-egg-sac-info.htm

Try planting red flowers because apparently the color red is not in the color spectrum that bees see. In the articles below, you can get red zinnias, red coneflower, red butterflybush, red hollyhocks, red bee balm, red lantana, and also red salvia.

https://www.uh.edu/engines/epi2877.htm

https://extension.illinois.edu/sites/default/files/what_are_the_best_flower_colors_to_attract_pollinators-1.pdf

https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-and-butterflies.htm

https://www.gardeningknowhow.com/garden-how-to/beneficial/how-to-attract-more-butterflies-to-your-garden-with-eight-gorgeous-flowers.htm