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If you send me an email with the image attached, I can try to ID it for you.

99% of plants do best when transplanted in either spring or early fall. These seasons provide the best conditions to make for successful transplanting.

This article may also help when you decide to transplant:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

This article should help: https://www.gardeningknowhow.com/plant-problems/pests/organic-snail-control-how-to-control-garden-snails.htm

We have found the best way to treat spider mites is with neem oil. Not only is it effective, but it's also quite safe to both plants and animals (as well as humans). This article should help you: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm

This happens because not enough light is reaching the lower limbs. When you trim the shrubs, trim them so that the sides angle in just slightly. This will allow more light to reach the lower limbs and prevent them from dying.

Sounds like a gall of some kind. Perhaps this link will help with identifying it: http://www.extension.umn.edu/gardeninfo/diagnostics/evergreen/juniper/branchesgrowths.html

Boxwoods are popular for this. They grow slowly so do not need to be repotted often. They will at some time need to be repotted, but it could take several years. Regular potting soil is best.