I have the same problem with my OpenEVSE charge station; the J1772 handle I got from Quick Charge Power is hard to plug in. I've sanded the outside of the handle port ring without success. I've also used silicone spray, but that seemed to make it worse; almost seemed like it made the plastic swell a little bit.I had the same issue. Put a light bit of silicone spray in the Male end and it has been perfect since.