1972 Duster Build with my Daughter

Wow.... Fixed the AC today, got in to take it for a test ride and nothing when the key was turned on. Looked at the ignition switch connector and in less than 1000 miles the damn thing melted the plug on the main power feed. I figured the original melted ones were just because the harnesses were old. I pulled the 5 large gauge wires out of the plastic connectors on both ends and looked at them. The spring tension on the Standard replacement ignition switch sockets sucked. The M&H harness pins were nice and tight. Well after thinking about it we put some heat shrink on them and soldered the 5 large high current connectors together. Man I am glad that did not happen on the trip last week...... That connector style is really just crap.
So nobody makes a connector that will hold up then?