Hi ozzy
Sorry to hear they did not work out for you. Ozzy you have much more knowledge of audio than me, but are they going the right direction? RCAs would be harder to tell than the XLRs. Also want to make sure the tips are clean on the interconnect and at the connection of the unit you are plugging them into. I have not tried any of the High Fidelity XLRs. I use Transparent Reference xl MM2 xlrs in my simple system. Would like to try some of High Fidelity XLRs, but the price of the mid level or higher in a meter and half or longer is just a little out of reach for me now. Its been cheaper and easier to just add the MC o5s. and i have not reached a beneficial end with them yet. I did try the High Fidelity speaker jumpers and ending up buying 3 pair of them for my speakers.
good luck Pete