@beanglow Have you tried eliminating dairy? Your problems sound similar to mine. It took a long time for me to figure out what the trigger was, and I finally came to realize it was lactose. I can now eat a little hard cheese, and I can have just a tiny amount of lactose if I take Lactaid. Lactaid does not help if I have a lot of lactose though.
The irony is that I was actually eating cheese when I was having soft stools because they always say cheese is "binding". Oops! I think I may perhaps have more than lactose intolerance though because it seems as if I do have the same problem sometimes when I do not have any lactose. As I said in another post though, maybe something I ate had lactose in it, unbeknownst to me.

Does Boost have lactose in it? I used to occasionally have Slimfast for breakfast, not for weight loss as much as for it being a very quick breakfast. It does have lactose in it though, so not often now. If I do use it I will take Lactaid and that helps. If you can tolerate Boost and it has lactose, then I guess that's not your problem.
JK