I do not know if a solution for the low symbol rates exist or not. The version2 (SF8008 Supreme) was falsely advertised, and now it seems the Version 3 or V3 Is also falsely advertised. And no one cares about it.
Anyway, I would suggest to upgrade to TNAP 6.1 if you are going to run TNAP. This process is simple. Put a Good usb drive with a gigabyte or two of storage in the receiver, select Flash image in receiver menus, Select TNAP 6.1, then highlight and select the TNAP 6 slot (with backup). Press OK button on the remote, come back in about 5 minutes or less and it should be completed.
If desired, get the C and Ku band epg running. You can get a bit of epg if you can understand the setup:
TNAP FTA Satellite EPG The epg topic is closed, but it does work.
More epg information is at the end of this thread, and if you check the whole thread, you should be up to date.:
TNAP-6 Image Discussion
The SF8008 is excellent for streaming. If you have a static ip, then you may want to consider the free Wireguard VPN or the firewall that is available to allow streaming over the Internet, and remote control of the receiver.