Yeah I have run against the "shock" censor list, because they mistook "shock" as a violent theme, even "tiny" was dock from the prompt. I was trying to go from small to large, and had little luck in the growing department.
Go from "flat chested" or "flat_chested" or at least "small breasts" to "gigantic breasts". Also use ((())) around the size to emphasize it, especially the end size. (((gigantic breasts))) will usually yield bigger boobs than just "gigantic breasts". But again, it depends on which model you are using. The sizing goes flat, small, medium, large, huge, gigantic. Sometimes a model understand "monstrous" as a size that is bigger than gigantic, and some models understand "hyperbreasts" or "hyper breasts" as an extreme size.
And again, look for a checkpoint that has been trained on just a little bit of porn. I have one that is too much porn and it makes all women move like they are having sex even when they are just standing there.
Punchy