Not only did they add another frequency on the original license, but they added another license with only the new frequency. WQRR724 is the first license and shows both freqs. with six transmit sites. The newer license, WQZR599, granted just last month shows only 155.0925 and is a single site that's different than the other six. Maybe they thought simulcast VHF was part of the decoding issues?
Separately, I've been decoding 155.0925 for about five hours now. I've got a very strong signal, but the error rate appears to be just as high as the previous experience back in April. Maybe it needs tweaking, maybe the new custom interface board isn't doing the job, or maybe something else entirely. I'll continue to let it run and collect data.