From a BC boy's perspective, Maui is not that gnarly. What is tricky about the "Plunge" descent is the fact it is littered with large loose lava rocks which make it unpredictable. If you are comfortable riding while your bike is all over the place you should be fine. It isn't that steep, it is just fast and loose.

I would choose a heavier tire rather than the lighter one for that course. The lava rock is super sharp so lighter tires end up shredded. I think the Maxxis Crossmark is a great choice for Maui. It is the right combination of tread coverage plus low rolling resistance. Can't go wrong with that. Load your tires full of stan's and you should be good to go.