Yes, but it seems clear now that the best route is going to be to work with the chip directly and not use the libraries. I may continue with the library as a stop gap, until i finish building up some boards, and then have at it, i.e. write a new low level library for high performance data acquisition.
I started perusing the chip documentation. The description of the ADC seems okay, The section on the interrupt handling seems incomplete. It points to another manual, but the reference is incorrect, and you have to find your way to a third document to find the register set and functionality for the interrupt framewotk. And, I haven't dug into the PDB yet. Those three pieces seem like the starting point.