[Dynsei]

My growth seems to be gradual. When I first started NB my breasts got sore, tingly and tender but that was within the first 2-3 weeks. Since then I haven't really felt any indication of growth.

I think you need to alternate between herbs that act on prolactin, progesterone, and estrogen. The growth probably stopped because the effects that caused growth also desensitized the receptors that slowed further growth from happening. Alternating or using them together helps re-sensitize the receptors.

Progestogens are supposed to be at their peak during luteal; and a smaller amount of estrogen makes an impact here.
Prolactin and IGF-1 makes more effect during menstruation.
Estrogen usually peaks during ovulation, but too much here may be unnecessary.

Additional phytoestrogenic, phytoprogestins, and prolactin make more impact during the time when the other hormone is supposed to be at its peak.