Hi,
Two smaller issues with CW side tone. The first one is the volume level. I am using noise cancelling headphones and therefore been using very low level side tone for years. With RRC even the lowest level (-50dB) is just too loud for me. It wears your ears especially in contests... Any change to scale that parameter even more downwards?
The second one might be a bit more tricky. As there is no real feedback from the transmitter for the side tone being generated RFI problems may be unnoticed. I seem to have a RFI issue on 160m and luckily I was monitoring myself with CW Skimmer at home to notice the problem. The TX was just sending a long dash even though listening the CW side tone everything sounded to be ok.