I was in the same position up until the half way mark of the DAT. I just decided (as I was eating lunch lol) to read the passage and then do SnD. I never really got over 17 in RC before, and ended up with a 22.
The passages I got were interesting, and I enjoyed them. Not sure what would have happened if the passage was boring 🙁 They were all science-ish for me.
If you are a fast reader, I'd read the first few questions and then read the passage. Don't stop to go for an answer unless you know you got it for sure. If not, just keep reading, and read it to understand it. After that, SnD should be a breeze. It felt like there were no tricks, but thats probably because when I looked for answers, I looked for the right places (because I understood the passage in entirety).
Try this way, maybe you will do better with it. Can't hurt I guess 🙁