Hi, Pink!
I have regular bouts of IBS, but I really don't watch what I eat. For me, it has more to do with my mental/emotional state. Sometimes nothing I eat bothers me, while at other times, an attack can come on unexpectedly for seemingly no reason. So, I don't have much good advice for you...sorry. I do think it has more to do with the mind/body thing than with our digestive system, which is very sensitive and responsive to our stresses.
Patty