Amaravati express comes with 17 coaches from HWH one UR coach is reduced by SER that's weird decision. But the main point is one SLR is detached at GTL so 17-1=16 coaches then 4 KCG Slip coaches added so maximum is 20 coaches.
Speed I agree with you it's definitely required. Both trains are too slow. Frequency increase is impossible unless RM or some political influences as SWR runs freights in empty slots of weeklies.