Not sure if mentioned.. but i get the sneaking suspicion that the various incarnations of the clots are not various incarnations, rather, Clots evolving during game play to be gorefests or similar.
Think about it, if you kite you leave clots generally, and dont touch them unless you have too. Essentially harmless if they are not spawning near or on top of you.
Suppose those clots you are not killing and running from are turning into...Gorefests when you leave them too long?
20 clots can quickly become 20 gorefests.
Not sure if true>? just guessing.