2005/02/13: Seems like the latest 1.1.1.3 and the new 1.1.1.4 behave much better in terms of search results and downloads. Finally.
So for now rest of the leech problem is only because of the default multinetwork behavior of Morpheus and GnucDNA which waste normal upload bandwidth normally reserved for one network (by separating upload slots available between networks and with the multinetwork overhead), thus lowering dl speed for other clients.
Case closed for now.