id agree with trying to take him up to 8ozs if youre sure its hunger making him cry and not colic or reflux.
he is obviously full in the eves or he wouldnt sleep so well through the night or it could just be a growth spurt making him want more during day.
I put my son on hungrier baby milk when he was that age but not for all of his feeds, i did it in stages because i knew that once he was the same on hungry milk my only option was to start to wean him early and i didnt want to do that. Saying that, I still started to wean at 15 weeks because of his hunger.