Would the benefits of Curcumitol-Q be enhanced further by continuing to take regular curcumin as well, which consists largely of curcumins I and II?

This is quite true and, in fact, this is a missed opportunity of this supplier in not doing so. They believe, falsely, that the magic is in curcumin III and therefore underestimate the fact that the benefits of the other curcumins derive from the combination, and that is true of curcumin III as well. Just because it has profound effects when tested singly compared to the others, does not speak to how various combinations perform. So adding back ordinary curcumin, which contains a low percentage of curcumin III to this curcumin III-rich supplement will round it out and make it even better and more effective in reducing symptoms.