Interesting thread Benay.
IBS-d here.

Not low carb but some of this info might be of use:

For me dairy is a no no and trying to avoid gluten as much as possible.
Fructans definitely make things worse.

Following fodmap suggestions and currently trying to include more resistant starch. Don't know if you have researched resistant starch yet but it's worth a look.

Seeing improvement at the moment so hopefully i am getting on the right track.