The 'growth' you are experiencing is fluid swelling and collecting in the breast, this will go down without keeping it up regularly. This creates a nice swell temporarily but will always go down after. The only way to make permanent growth by noogling is to have the breast under constant low pressure for several hours a day. When the Brava device was tested (and proven to work) it was worn for 14 hours a day for a few months. The average permanent growth was just under a cup size. The reason Brava went out of business was because that length of time commitment for minimal growth was not seen worth the money by many women.
Some people are just lucky to have their growth, but they did work very hard and consistent for what they achieved, don't forget to read the posts about nerve damage, one girl who was my inspiration for growth with noogleberry and minimal or no herbs in her regime came back several years later talking about how her nerves had been messed up from them being sucked into this cup.
The negative pressure is going to cause not just your cells to expand but also your blood vessels, lymph and nerves. So do be careful. If you are light skinned, never let your breast go purple, and if you are dark skinned, be very careful testing up your tolerance and stay in tune with your body, never let the breast go cold. This happens to me a lot when I noogle at a high pressure or leave the dome on too long. I believe the 7:2 method worked best for me, pump for 7, massage (deer) for 2. and I saw a lot of swelling that i loved, but i am afraid i must say when i stopped i lost all of it over time. 
I think combining noogling with some kind of hormonal supplement may help as the noogling brings the blood with the hormones to the breast to occupy the tissue and activate the cells, then the resting massage will help flush out those hormones again ready for the next to come in.
Over extensive periods of time, negative pressure does cause tissue growth, but it is always minimal in clinical scenarios. So noogle and enjoy it, and stay consistent, but just know you are not strange and there is nothing wrong with you for the swelling going down again, this is just the body doing its job. The more you noogle, the more the swelling stays there, and hey maybe you will get some growth alongside it if youre consistent, but please dont be so desperate to damage your nerves and health later down the line.