Apply for RA with some prof in univ,probably IISc. I think the deadlines are up for this year, Don't take corporate internships, unless you're interested in a job atleast in India.I was at a similar situation as you 've described, after one year of working with in a R&D position(Not too much R in it), applied.
What I did was I took job, and internships only in my field of interest. That might help. I had circumstances that made me choose this. But, now I regret not going to a few RA offers after I graduated. The point is, its what you want, finally. Research experience or corporate etiquette.