I think it's realistic to accept that for most people, MDMA is not a 1 day ride. It's more like 3-4, and that's if you don't over-do it.
Taking less certainly reduces the impact of the comedown, but repeated dosing may not. Try finding the lowest dose which still allows you to find the magic. It won't be as intoxicating, but beauty is still noticed and felt.
By taking infrequent, smaller doses, the "honeymoon" period typically reported with MDMA, can be greatly extended.
I personally find the comedown to be of significant importance to the experience. It's definitely the best reflective phase, where you are likely to discover the most about yourself and others. It's just not all cushions and feathers like the roll itself.
If it bothers you, and you wish to continue using the drug, my advice is to read up on pre/post loading, reserve yourself the time afterwards to relax with no additional pressures, and get adequate sleep and food before and after the roll.