its departure can be kept at 17.10 i.e after departure of 12030 / 12032 Shatabdi express from Amritsar jn. and if possible removal of few halts between ASR - NZM will help CG to speed up.
But as @ShikariShambuJr mentioned that work of underpass at New Delhi on SBB - NZM stretch is going on so the delay for CG, Golden Temple, Nanda Devi and other trains is inevitable.