Yeah I noticed same thing.
I was using Morpheus before and switched to Limewire to see if it had same problem.
It does.
My best guess is it has something to do with the use of these UltraPeers.
Both Morpheus and Limewire appear to enforce a relatively low number of UltraPeer connections. The only way to try to get better search results/ connections is to manually remove (drop) one of the UltraPeers and hope you get a 'better' Ultrapeer.

Pain in the butt!

Morpheus is written in C++, Limewire in Java. Maybe the hardcoded limit can be changed in the source code and re-executed. (Morpheus would require a compiler, Limewire just the runtime to do this)

Anyone think of another possible solution?