India could consider declaring at tea with a target of 200+. Then try and get 3 or 4 Aussie wickets to get an psychological advantage going in to Nagpur.
I agree. We are 141 runs ahead now with only 10 mins past lunch. If we can get to 200+ lead by tea (which we should), we should declare and think about doing something to the Aussie batting before Nagpur. If they go for 200 in 30 overs, we would love it as it would open up big chances for us. If we get few wickets, its a psychological advantage for us as you said.