This morning I spent one full hour using the knowledge acquired in this video:
http://youtu.be/115erzCCxgE Hope is correct now.I checked a big bunch of caps, and, when coming to those collected after disassembling uncountable boards, there was one branded Capxon, sporting the highest ESR in this session: almost 6 ohms.

Sure I heard of than brand before...!
Let's say that one third of my caps were discarded and I feel better. Thanks Alan.

Back to current sources now.