A Question on M

for anyone who has read harrington's book when he talks about M, your stack / blinds + antes. He says that you have to be willing to gamble more the lower your M gets etc... He talks about the red zone really well and describes how to play it. However, he doesn't really talk about the adjustments for the yellow and orange zones except you have to loosen up more and play more aggressively. Maybe someone can help me here by what he means such as if I have a low yellow zone M and am in early position what new hands should i consider playing? Or if i'm in the orange zone and someone raises the pot and i have AJ should i reraise all in and start gambling at this point or should I wait for a better spot even though time is running out cuz i'm on the short stack etc?