Just stayed in the St Regis Mumbai which used to be Palladium.
Excellent experience (though I maintain that pool is built on the wrong side of the hotel), but why not give the opportunity for a late check-out until 10PM for 50% of the cost? Anything after 6PM is charged as a full night.
Especially for guests on flights to Europe (mostly departing around midnight - 2AM) this could be a valuable enhancement attracting more customers.