Best thing would be to start a dedicated new Train to SBC from Mumbai. 17317/18 should be terminated at CSMT instead of DR along with an increase in coaches to 22/24. This train can then have RSA with new Mumbai Bengaluru Train. 17317 arriving Mumbai in the morning can depart after a 1.5-2Hr break as CSMT-SBC SF via MRJ-UBL-ASK and reach SBC early next morning. Return journey can start from SBC in the evening to reach Mumbai next day around 6 in the evening. The same rake can then depart as 17318 to Hubbali.
PM at SBC