16.8db SNR here, but still only 4 green lights and no ID as yet. They've recently returned to Shortwave after having a new TX installed (by Ampegon I think), and have been putting a good AM signal in on 15540 since they came back on again. I'll try it a bit earlier tomorrow, the Bulgarian DX Blog shows it as 1800 to 2100 UTC.
Modified NRD-525G with Radiokit DRM Decoder Board,
SDRplay RSP-1A, Airspy HF+ Discovery, Dream v2.1.1
Lancashire, UK 53:39.18N 02:10.28W IO83vp