Tvheadend

Hi there!

I am currently building a new setup using a digital devices octopus S2 CI Pro (a dd cine s2 (=2 adapters that should combined be able to manage at least 4 channels) with 2 built in cam slots) and a inverto quad lnb with two legacy ports.
I built a small Ubuntu (version 16 I think???) server, plugged in the card, installed TVheadend and booted everything up. After one or two mental breakdowns and a ton lot of coffee everything worked. (yay to me!)
However, Currently I can only watch two different channels at the same time. So is there any way for me to add a second frequency to both adapters?

And before anyone asks, yes, I am willing to mess with absolutely everything if it's required.

Would be great if someone could help me.

Additional info:

DUR-LINE Unicable-LNBs (UK101-UK102) + Inverto Black Unicable-Quad LNB mit 2x Legacy (ST Unicable-Chip):
ID1 / IF-Channel 1 (SCR0): 1210 MHz
ID2 / IF-Channel 2 (SCR1): 1420 MHz
ID3 / IF-Channel 3 (SCR2): 1680 MHz
ID4 / IF-Channel 4 (SCR3): 2040 MHz

Adapters:
ls -l /dev/dvb/
insgesamt 0
drwxr-xr-x 2 root root 120 Nov 18 14:45 adapter0
drwxr-xr-x 2 root root 120 Nov 18 14:45 adapter1
drwxr-xr-x 2 root root 80 Nov 18 14:45 adapter2 //probably ci slot
drwxr-xr-x 2 root root 80 Nov 18 14:45 adapter3

http://prnt.sc/d8vufe

Adapter config (second one is the same with the next frequency)
http://prnt.sc/d8vv5g

PS: Btw, is it just me or is the default mux for Astra 19.2E wrong?