With Charminar changing terminals from MAS to TBM, the slots of GT and Charminar can be interchanged. GT can take the 18.10 slot from MAS and teach NDLS by 5.00 or 05.15
This will also allow TN to be speeded up by making it reach between 6 and 6.30. It could avoid both AP and Rajdhani Overtake.
Charminar...
more... can leave TBM at at 18.00/18.15 and use the current GT slot till WL. It will still be able to reach SC at 07.30. Since Charminar also has LHB rakes, it can slightly run faster between KOK and KZJ thus keeping the MS - SC run under 13hrs