Well...the slippery elm can't hurt...I also like marshmallow for soothing the bowel...but can tend to be constipating if taking too much. Either would be good.
Going too much shouldn't cause bloating and cramping...it may just be your colon adjusting to things moving through...all shapes and sizes, can distend the walls, etc. Keep drinking water... Try the slippery elm..it certainly can't hurt.
How's the diet of late? Be sure not to eat fruits and veggies at the same meal..that can cause some of the symptoms you mentioned too...and no liquids with your meals.
Hope things even out soon! Sounds like you are doing great, otherwise.