I would argue the need to have tubing for a "snugger" fit means your not getting a proper connection with the connector. That would be worse than a 6.5 with the proper fit IMOI,m surprised you find the 8mm harder to disconnect. Maybe the brand. I run them in all my boats and started using a small piece of silicone tube inside the male plug for a snugger fit.
+1 on the Neu connectors, I've had excellent results with them.It is very enlighting Grim! Jorge the world record hold from mid 2000's to last fall at 140 mph, ran the tests back then. Fit is very important but they don't have to be so tight you can hardly get the apart. The fit is easly adjusted.
I use only Steve Nue's ( Nue motor mfg) bullets MUCH better than anything else.
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