Two comments, and I want to see your thoughts:
1) Throughout my playing career, every manager I ever had told me that double headers are 80% of the time split. And in my experience, that has definitely held true as I can only remember one or two times out of roughly 10 that the double header wasn't split regardless of the talent difference on each team. There are a few reasons for it one being concentration levels, two being law of averages, fatigue, team's willingness to not drop two on the same day, whatever. I don't have any solid concrete evidence to back this up as I am too lazy to look up stats. I am in no way trying to talk down your bet, because if you like both games, you like both games. I didn't have an opinion on those games personally so if you see something you like in both games, don't let my "non-opinion" stop you. There was one double header I remember earlier this year that was swept. Maybe a Cubs series? I just remember making a mental note of it because it was rare. Anyway, like I said, just a COMMENT I'd like to contribute, and nothing more.
2) I've been betting the dogs a lot lately. And for whatever reason, I've noticed a stupid trend. But whenever a line is about +150, that dog always seems to win way more times than not. I'm curious to see if that holds true again with your San Fran bet.
Best of luck again tonight.