Hi Pavel,
your 17:00 and 18:00 UT transmissions were also received in Nuernberg. I tried to manually optimize the decoder settings, and found that both decodes became stronger when I used 1.8 seconds more delay (e.g. start time 18:00:01.8 UT). I checked my PC clock, but it is correct within 0.02 seconds.
73, Markus