Update:
Manually search and also some new sattelite.xml`s did not help, i checked now the missing channels a little more in deep. and it seems that all missing channels are "H - High Band" channels, for example: » DVB-S2, QPSK, 11992 MHz, H, 27500, FEC 9/10
Working channels are located at: » DVB-S2, 8PSK, 11171 MHz, H, 22000, FEC 3/4
>> "H - Low Band"
H(High-Band) 11,70–12,75 GHz
H(Low-Band) 10,70–11,70 GHz
I will check my LNB the next days and will come back to you with some feedback, anyway thanks for your help and answers!
best
creepy