First of all, why pick two spinners at Trent Bridge (I'm being generous in describing Dawson as such, rather than just a slow bowler)? The Times quoted an MCC member at Lords during the first Test, a portly, florid-faced individual: 'If Dawson is a test player, I'm a Brazilian fashion model' and that just about sums it up!
If Balance is to continue, he has to move down to 5 and, I'm afraid, Keaton Jennings has been found wanting, despite that ton in his first test. Whether Stoneman is the solution I have doubts, particularly as he's another left hander, but he seems next in line.