fwiw, i'm still using deans plugs but have mostly the chinese copies now. the original deans connectors are difficult to pull apart with their smooth outer surface.
to solder i tin the wire then the connector and while they're both hot I just melt the wire down into the tab by stacking the wire onto the tab and pushing down with the solder iron. i use a pair of needle nose with an elastic band on the handle to clamp the connector and a small spring clamp to hold the wire. takes little time and the connection is solid.
i can see the lack of enthusiasm with Deans connectors but I can't see myself replacing them for little overall gain.
bart