Best Option is, in any section up to GHY don't go more than 65-70. Check other trains speed in the section. after GHY make speed 55-58 up to Imphal.
make it as Mail/Express or Super fast (Non A/c with 5-6 A/c Coaches) will good and increase halts also. don't make Final average more than 58.and G coaches gone from IR except in GR's remove them. better cc like this
LOCO,SLR,GS,GS,S1,S2,S3,S4,S5,S6,S7,S8,PC,S9,S10,B 1,B2,B3,H1,A2,A1,GS,GS,GS,SLR