I also had a similar problem, couple of things i did:
- Stopped practicing RC questions.
- Started reading articles on obscure topics on the net, just google stuff like socio economic impact of on or read WSJ, Economist.com etc
- As i read these articles, started sketching them on paper, headlines inferences etc.
- After couple of weeks of this, picked up MGMAT guide for RC and looked up the strategies listed there and applied them to some more reading i did online
- Started with MGMAT questions
The result was dramatic, from 10-20% correct with > 2-3 mins/qs i went to 90-95% accuracy and
I don't think there are any shortcuts