Though you say they dont jump, it sounds like a spring tail (there are different types). I have found a lot of the globular form in my media mixes over the past year. They have fatter bodies, and are dark in color. Look like black pepper crawling around. I also have found the longer form that you may be seeing. Typically a silver-gray color, thinner, very small (up to 1.0 mm) and found under pots and in mix. You really want to see them, go out with a flashlight at night, and inspect your pots and mixes.
Most feed on the decomposing media, but may feed on roots. Ive been working on them by repotting, and treating with my home brew insecticide (water, alcohol, dish soap). I dont use stronger chemicals. It has helped, but i know they are still there.
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