When Stuart Broad bowled the keeper was standing near the stumps and that says a lot about their energy levels and may be so is the reason the fast bowlers were not used.
Out of the total of 86 overs that India batted, Broad/Stone bowled just 16. On the other hand, the spinners bowled the remaining 70 overs. I agree that the fast bowlers can't be used for long spells under such hostile conditions. But Joe Root could have given 10-12 overs each to the two pacers. If he had done that, then most probably they could have got the lead under 350-400. Now the match has slipped out of England's hand.
Just now England lost two quick wickets - that of Rory Burns and the night-watchman Jack Leach. They still need 430 runs, with just 7 wickets in hand. I won't be surprised if the Indian spinners wrap up the match before tea tomorrow. After such a great performance during the first test match, England was disappointing during the second match.