Using the information brought to light by VHS archivist https://youtube.com/c/bdalborsArchive/ , a clearer picture is emerging of Super Sunday airdates.
For the first 4 weeks, the show ran with two Robotix segments and one Bigfoot segment, before being joined by Jem.
Robotix 1st run: 06/10/85 - 15/12/85
Bigfoot 1st run: 06/10/85 - 01/12/85
Robotix and Bigfoot both had confirmed 2nd runs in December, assuming those runs were complete{
Robotix 2nd run: 22/12/85 - 30/03/86
Bigfoot 2nd run: 08/12/85 - 02/02/86
Update 10/09/22
Further information has become available. After the show's second run, Bigfoot was dropped from the rotation, with Jem getting two out of three segments for its second run before the arrival of Inhumanoids at a currently unknown point in April 1986: KBHK-44 commercials, April 1986 part 2 (kids ads) : Free Download, Borrow, and Streaming : Internet Archive