744 fuel policy
In most I've come across, and the one I fly now, all what you said [std] plus min 10.5 if the destination /altn wx marginal or known for congestion eg Lhr.
I know of another major SE Asia operator reducing the cont from 5% to just 2-3% for LH/ULH sectors. They work on pred flt plans updated 1/2 way when new fresh plans come over the ACARS with new pred [winds].