I feel like we cannot give you advice on how to dose your medication as we are not doctors. As a general rule you need to stick with what it says on the leaflet that comes with the medication. It would also be against the rules if I told you to take a certain dose:
4. Do not diagnose people based on your prior experience, or prescribe them a certain type or dose of medication to take.
If you rely on laxatives so heavily you really need to see a doctor about things.