Stick with the miralax. Personally, I'd keep your acacia dose the same for now. Give it another week, if no improvement, try adding in a second dose of miralax at night. I would try a second dose of miralax at night for at least a week before trying the dululax. I've taken that before and it was horrible. Terrible cramps, doubled over the potty for hours, save it for the very last resort!
-------------------- Taking it one day at a time.....