I am facing the same issue. A couple of things that I noticed with my errors:
1) I was picking answers that were inferring a bit too much. I think RC inference and CR inference have the same basic principle. We shouldn't pick answers which cannot be directly deduced from the passage or the argument
2)I also noticed that I was answering these questions too fast. This was very personal to me so may not apply to you. I have been answering these type of questions in 30-40 seconds on the CAT. So one of the things I will do next is to slow down a bit.
There is a very good article by Stacey that I came across last night only: