MgGee em Keys To Good Cooking , recomenda algumas coisas que vão direto ao problema que você descreve.
Primeiro, ele recomenda trabalhar com temperaturas mais baixas (seus negritos, seu itálico).
Searing meat does not seal in its juices, and moist cooking methods do
not make meats moist. Juiciness depends almost entirely on how hot you
cook the center of the meat. If it gets much hotter than 150°F/65°C,
it will be dry.
Em segundo lugar, ele recomenda a salga como um meio de garantir que as aves magras retenham a umidade.
Brining is the immersion of meat in a weak solution of salt and water,
with or without other flavorings, for hours to days before cooking.
Injecting brine into the meat interior speeds the process. The salt
penetrates the meat, seasons it, and improves its ability to retain
moisture and tenderness.
Brines of a certain strength, 5 to 10 percent salt by weight, also
cause the meat proteins to absorb extra water from the brine, making
the meat seem exceptionally juicy when cooked. Very lean poultry and
pork can benefit from this extra moisture, especially when they’re
overcooked.