Played around with a few different scenarios on this and it would seem that, at the split, positions 5 to 7 will be filled by Hibs, Killie and Livingston. However it is just to close to call in what order. Could come down to goal difference.
Bottom 3 will be St Mirren, Hamilton and Hearts but again it is very close.
Even if Hearts went on a very improbable unbeaten run then they would probably be 9th at best.