Travelled in this train till VSKP. The speed of the train at night, especially from BAM onwards is furious and sleeping on the berth feels like you might be thrown away from the berth at any moment. Could be due to my berth position just above the train bogie.
Myself also had a very similar experience while travelling by the KING of SER. Its not the fault of your berth as you are talking about but I personally feel that trains like Falaknuma & Coromandel do a bit overspeeding during night time.
its due to mostly CBC rakes , even i had same experience in MAS-TVC Mail
Its not just CBC rakes. I have felt in MAS SBC mail too. Especially on the curves,it seems that the centrifugal force(:P) is trying to throw you off the berth!