I have had big problems with a Summit/Bally reel connection with two of those Beau connectors. You might try to clean the male terminals with a cut down eraser, the pink school supply type. With it, you can polish in-between the pins, and will give you somewhat of advantage with the connection.
The other problem is with the female terminals- they lose the spring tension and a bad connection happens. Not much you can do except replace the individual terminals (PITA) or try and find a connector.
Or, do what Bally did in the E series machines; convert to the MOLEX pin connectors which are marginally better than the Beau connectors.