Don't try to expedite vacating with a heavy if it's rainy! Whatever the ATC says!
As mentionned, they don't fly our airplanes!
And don't worry: in BOM there's nobody 3 NM behind, it's always 10 NM behind even on an ILS ( 27 for instance )
And I've never heard of a serious Saab friction test in BOM!
Nothing!
So when landing in BOM with rain with a Heavy: A/Brake Medium ( on Airbus ), positive landing, full reverse,
and you vacate when it's safe!