pharmacist
generally things will stay the same all the way through, subject to normal variances (diet, sleep, nutrition etc all having an impact on various enzymes/molecules floating around, such as aromatase)
theres no obvious reason that the level of aromatization will decrease merely because of time on cycle, unless theres a feedback loop im missing (and truthfully, i havnt looked up what sort of feedback loops taht aromatase is subject to)
cheers