Audioquest SKY rca loose connector (no fake cables)

Hi guys, I need your help.

I’m trying out a pair of Audioquest SKY rca (they’re original, first generation with 72 volts DBS) and all four RCA connectors are a little loose in the contact with the female RCA pin of my Audio Analogue Maestro preamp. I unscrewed the connectors and tried tightening two small screws that hold the negative side in contact with the outer collar, but nothing changed. Does anyone know how to make them more solid in contact?