Update: I've found that the USA NAS is in press with their amino acid RDA's,
and they average over double the WHO ones:
Amino Acid WHO NAS
Isoleucine 10 19
Leucine 14 42
Lysine 12 38
Methionine + Cysteine 13 19
Phenylalanine + Tyrosine 14 33
Theronine 7 20
Tryptophan 3.5 5
Valine 10 24
total 83.5 200
See
http://books.nap.edu/books/0309085373/html/530.html
Still seems low compared to the total protein RDA, but better.
The quest continues ...