Hey,
I've had similar issues with my Carat.
I got the epic run cable with the 00 lemo connector. The first issue I had was that the lemo didn't fit into some sync ports. I tried it in various different epics and dragons to varying degrees of success. Apparently they used crappy indian made lemos. I got a replacement one sent which had the same problems.
In the cameras I could get the cable into I had the same run issues you mentioned. Turns out they were wired for the control port. I got it rewired and a proper lemo connector put on and in the tests I ran with it it was working fine. It went on to a job the next day and it wouldn't run the camera again... Not sure why that would be, but maybe it is an issue with the receiver as you mentioned? A new run cable with the BNC connector was made up for it and I believe its been fine since then?
ps. What 9v batteries do you use with it? The handset is pretty power hungry.