Yes Old route is best, I will propose below departure Time Table keeping in mind running TT of other trains -
Bhiwani - 4.50
Rohtak - 5.50
Gohana...
more... - 6.20
Panipat - 7.20
Karnal - 7.50
Kurukshetra- 8.20
Ambala - 9.30 (possible overtake by Kerala SK before UMB)
Chandigarh - 10.15
Kalka (Arr) - 10.50
Return -
Kalka - 16.45
Chandigarh - 17.30
Ambala - 18.15
Kurukshetra - 18.50
Karnal - 19.35 (Overtake by Swaraj Gang before Karnal)
Panipat - 20.15
Gohana - 21.10
Rohtak - 21.45
Bhiwani (Arr) - 22.50