The stock HD headsets suck. J & M appears to be an improvement, with the exception of the intercom feature. Their shorty antennas sure work great. Wonder if they will offer a new & improved version, based on feedback?
I can understand the predicament J&M is in, trying to offer their set-ups for all makes and models. The make one version of each set-up and address the different requirements of each system, whether it be an OEM system, or their own. When the new HK radios came out, they didn't change their headsets, but built a new cord with different resistances to match up to the radio.
A headset / microphone combo designed especially for the HK radio might well fix the intercom issue. I think the microphone needs a higher output, or gain. That way, the VOX sensitivity could be set lower, and the output volume setting could be lowered. On my bike, I have the intercom settings, VOX and volume, pretty much maxed out to get it to the 'acceptable' level. If I had a hearing problem, I'd be out of luck.