The Raiders failed to cover in their last outing by 21. The game before that, they failed to cover by 31!
What happens to teams that fail to cover by at least 21 in their last two games? 16-19-1 ATS
What if they were a home favorite last week? 1-6-1 ATS
What if they were also a home favorite the week before? 0-2 ATS
This leaves nothing else to narrow down, such as this is a division game, a prime time game, etc.

In the Norv Turner era (2007–present) the Chargers have done well in these spotlight games. In games at home on a Thursday or a Monday the Chargers are 5-1 ATS
Also, the Norv led Chargers always seem to pick up the pace later in the season. From week 10 on, the Chargers at home have been a good bet, going 13-7 ATS, and against divisional opponents, they went 6-2 ATS with one of those losses being the 13-28 loss to the Raiders last year.