Yeah, check out the FAQ - I'm sure one question in there is about senses. However, what you say about olfactory senses and multiple sensory organs to 'triangulate' vibrations and such are supreme theories. I also love your comparrisons to Earthly creatures. I may feel inclined to include those idea next time I update the FAQ.
As for Paramites, I agree they seem to be a more... hmmm, well, communist pack creature.
However, in the Paramite Herd video, there is one Paramite ahead of the rest of the pack who stands atop a cliff as if to lead the others, though I suppose it could also be a lookout, checking for any dangers ahead.