I am NOT an expert. I had a series of 10 colonics a few years ago. I got an abdominal massage each session and a castor oil pack for 3-4 sessions. I noticed on another board, you said the massage would make you sore. Well it does, but it also works as does the castor oil pack. I wasn't constipated so perhaps that was the difference. Maybe a different colonic therapist would have better results. I went to a couple, before I chose the one with whom I did the series. I had the probiotic insert on the last session.
What does your diet look like? Water, fatty acids, fiber, raw vs cooked,type of protein can all have an impact.
There is bound to be some herbal formula that will assist with solving the problem. Perhaps Schulze's intestinal formulas