Hi Virginia
I'm not the most experienced on here ^_^ But I'll do my best to try to help you out.
Hmm, when you do the Female Deer- did your breasts actually get smaller, or did they feel like they were getting... tighter/ more compact? It may just be you thinking they're smaller, perhaps because your breasts aren't often handled?
I can kind of relte to what you mean about the Chi massage. When I do it I don't feel a sagging kind of thing. I feel like my breasts are getting stretched a tiny bit, and are a bit "loose" but I think it's the motion. I think it just feels that way because the motion makes it seem like it's loser, it may be because your breast is in your hand, and when you stop you suddenly realize it's not supported by anything, thus the "sagging" feel.
I don't really feel anything when I massage. No swelling that I can tell. No pains, no growing feel, just very slight warmth. I don't think this means it's not working. It just takes time for something to happen.
I think you should try to continue, and measure or take pics and after a while if you notice any shrinkage, stop. If you're not comfortable with it though, try to find something else.
Sorry, I'm not great at helping out.