For England to win in India at the moment they need everything to go their way - they need the toss, to perform at their best when India underperform, and a bit of luck with the weather (more or less the same as India would need to win in England really). We aren't doing badly, all things considered.
I watched some footage of Duckett yesterday and on reflection, there is a definite technical flaw in his defence. He plans to stay leg side of anything the off spinner bowls and hook his defence rather than defend down the stump to stump line. That method was fine in Bangladesh, where the wickets were raging bunsens, but on Indian wickets which turn inconsistently he hasn't got a natural answer to the will-it-turn-or-won't-it conundrum. He'd do well to look at how Hameed and Bairstow have decided upon different but very decisive methods of playing that allow them time to adjust to the ball.