From what I know, adding more probiotics would be counterindicated with SIBO. Read Dr. Galland's material on his website mdheal.org where he covers much of this material. You would be triggering more immune reactions by adding probiotics or anything that may be feeding the infection. By stimulating immunity, you will set off all kinds of other issues including neurological, endocrine and other things.

SIBO as you know is an overgrowth of bacteria in the gut, some have indicated that
a deficiency of digestive enzymes can allow the bacteria to grow, I would think that by adding anti bacterial things is what you want.

I would watch the types of foods you are consuming as well as supplements that may be encouraging the growth of the unwanted bacteria. The could be feeding on sugars, or high sulfur content etc, also some supplements may be helping them. The only way to unravel this is by trial and error.

Some basic info why parasites are attacking:
EVERYONE has parasites without knowing BUT if the blood Ph level is not neutral, either too acidic(ph less than 7) or too alkaline, both can burn tissues therefore irritate the parasites. When the blood chemistry irritates them inside the body, we get bloatedness or even growth or tissue blockage caused by their secretion. On skin, they worm or sting or claw! Root cause: partially clogged liver or/and kidneys. These 2 organs filter out unwanted chemicals, among other functions (search internet for liver functions). All kinds of ailments, they call incurable because they are due to our blood) can happen. parasite overgrowth can cause some of them to form internal growth leading to cancer!

Simple cure: take one Dandelion Complex tablet by Vitahealth and a Shaklee Alfalfa either before bed if you have no chest/stomach pain) or morning after meal. The Vitahealth brand has Dandelion with Burdock. The latter unblock the lymphatic vessels to cure cancer and growth( cyst). Effective to cure my breast lump years ago, never once repeat. Why also Alfalfa? It kills the worms loosen up from the clogged tissues!
Caution: strictly one Vitahealth Dandelion Complex a day. More can cause a strong parasite purge in the stomach like having food poisoning pain!