Well you have IBS right? So this is just one thing to be expected for IBS'ers and to be honest NO ONE has the same exact stool consistency ALWAYS.... not even non-IBS'ers.
It is never a good idea to self diagnose. IBS mimics many other GI disorders.So I would urge you to seek a diagnosis from a Dr.All the bestI don't know if I have IBS but all the symptoms are there.