So what’s the bottom line for a layman like me who only knows if the music sounds good or not…should I suffer with the poor connection of the Blue Jean cables or go to a different company and if so what company has better connections….there is a lot of snake oil out there…
I would hope you can identify snake oil, usually making special claims about lifting veils and whatnot...
The bottom line is that any good quality cable, regardless of its possibly low cost, will work well... that even at the capacitance levels Don has used in the simulation, you won't experience any degradation.
For you... if you are returning cables, do not play with them: that means don't try to tighten the fitting. Return them and hope for a refund. "Modifying" them in any way will be a certain dismissal of any claim you might have.
If you order from Amazon, you'll be able to return items pretty easy if they don't make a good connection. Other companies may be more challenging. If there is a "locking" RCA plug, as suggested, from WBC, and you don't mind the cost, try it.

Connection security shouldn't ever be a concern then.
I am not trying to talk you into trying the Monoprice, so please don't misunderstand, but just using it as an example of something I am familiar with the connection is secure and I have pulled them a few times with no loss of gripping strength. Perhaps it is best stated as there is not necessarily a correlation between cost and perceived quality when it comes to that connection. Just make certain you are buying an all copper conductor and if shielding is important to you, that it is part of the cable.
