Route needs to be longer to skip stations you mentioned as the whole load will come directly on Bilaspur and Raipur to fill the train.
Till now i haven't seen any train be it Duronto or LTT PURI LTT ever skipped Gondia & DURG above 40kmph as in case of the stations which you mentioned generally skipped on MPS.(Correct me for the last few lines if i am wrong)
So either extend this VB or Speed up required by 1:30 hrs at least.
Also...
more... i am in doubt for patronage between Nagpur and Gondia once N.Gadkari dream metro project turns into reality between the above mentioned stations.