For IBS problems you might want to try out boulardii and if you have floraster in australia, I would try that out. If not, I would get the standard process boulardii product prosynbiotic.
I wouldn’t do the cleanse personally, it doesn’t do much to impact candida numbers.
I’d also look up movicol side effects and see if those are whats affecting your digestion. I would consider looking for alternatives.