Tuner configuration: Triax TDSR 508 multiswitch and VU+ Duo 4k (Twin DVB-S/S2/S2X FBC Tuner )

[New2SAT]

Hi all,
Hope you can help, I have been trying to setup my VU+ Duo 4K with the Triax TDSR 508 multiswitch to allow 8 channels of recording and so far not been successful.
My LNB is an Inverto Quattro (IDLB-QUTL40-PREMU-OPP)
The tuner in my Duo 4K a Twin DVB-S/S2/S2X FBC Tuner plugged into the Tuner A slot.
The cable connecting the tuner is plugged into the top connector of the tuner card
I am running OpenVix 5.2.019
The satellite I am tuned to is Astra 28.2E

So far I can tune all the stations in simple mode which proves that the card and hardware is working but that doesn't allow me to use the FBC element of the tuner and make multiple recordings.
I also have two outputs from the switch connected to a Sky+ HD box which is working fine - again showing that the Switch and LNB is fine.

Some queries
1. Does it make a difference which physical input on the tuner card that I use (Top or bottom)?
2. How is the top or bottom card input recognised in OpenVix - I can't find anyway of selecting it.
3. How should I setup the tuner so I can make multiple recordings?
4. Which User band frequencies should I select for each of the tuners (A-H)?
The switch is capable of providing Sky UK/ Unicable I and Unicable II user bands (see attached 318182-318183-318184-tdscr504-2-61804.pdf)
I am using it for Freesat and have chosen the Jesse/Unicable II (EN50607) settings. However, its not working

I have tried the following without success:

Tuner A
Configuration mode: Advanced
Satellite: 28.2E Astra 2E/2F/2G
LNB: LNB 1
Priority: Auto
Type of LNB/Device: SCR(Unicable/Jess)
SCR (Unicable/JESS) type: User Defined
Format: SCR JESS
Position: 1
Channel: User band 1 (UB4 - According to TDSR user manual)
Frequency: 09850
LOF/L: 09750
LOF/H: 10600
Threshold: 11700
Connected: No
DiSEqC mode: None
Force legacy signal stats: No

Tuner B
Configuration mode: Advanced
Satellite: 28.2E Astra 2E/2F/2G
LNB: LNB 1
Priority: Auto
Type of LNB/Device: SCR(Unicable/Jess)
SCR (Unicable/JESS) type: User Defined
Format: SCR JESS
Position: 1
Channel: User band 2 (UB5 - According to TDSR user manual)
Frequency: 10500
LOF/L: 09750
LOF/H: 10600
Threshold: 11700
Connected: yes
Connected to: Tuner A: Vuplus DVB-S NIM(45308x FBC) (DVB-S2X)
DiSEqC mode: None
Force legacy signal stats: No

Tuner C
Configuration mode: Advanced
Satellite: 28.2E Astra 2E/2F/2G
LNB: LNB 1
Priority: Auto
Type of LNB/Device: SCR(Unicable/Jess)
SCR (Unicable/JESS) type: User Defined
Format: SCR JESS
Position: 1
Channel: User band 3 (UB6 - According to TDSR user manual)
Frequency: 11500
LOF/L: 09750
LOF/H: 10600
Threshold: 11700
Connected: yes
Connected to: Tuner A: Vuplus DVB-S NIM(45308x FBC) (DVB-S2X)
DiSEqC mode: None
Force legacy signal stats: No

Tuners D=> H I configured as Tuners B and C but with the following User bands:
D: User band 4: 12750 (UB7 - According to TDSR user manual)
E: User band 5: 13400 (UB8 - According to TDSR user manual)
F: User band 6: 14850 (UB9 - According to TDSR user manual)
G: User band 7: 15500 (UB10 - According to TDSR user manual)
H: User band 8: 01615 (UB11 - According to TDSR user manual)