I have studied the occupancy of all 3 intercity trains from Mumbai in morning towards Madgaon from June both in monsoon and Regular

1. Jan Shatabdi express is mostly used by locals of Ratnagiri to Sanatwadi section travellers 50-50% to Madgaon and was always in WL for a week both in GS and ACC.
2. Tejas and VB operate on alternate day...
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during Monsoon from June to Oct end for 5 months. VB being 8 coach is always full with WL while Tejas has more capacity then VB so current availability during weekdays during Monsoon. During regular run from Nov to Feb end being tourist season both VB and Tejas are full in all days. Tejas has 30% occupancy to Ratnagiri konkan region.

So though 3 trains are running they have enough of travelers that cannot be cancelled
Coming to new trains a new city in needed from Sanatwadi leaving at 500 to reach Mumbai by 1230 and return at 1500 which is the first priority. There is no intercity in during day time for konkan region except Konkan/ Mandovi express.( Not sure of the name).
As capacity addition a new VB of 8 coaches should be introduced from Madgaon with 600 dep to LTT.