CDs are TDKs rated at 32x. Why SMART-BURN can't figure that out I do not know. Anyway, apparently at about the 50 min. mark, the current speed (~34x) proved to be too fast for the media and the burner decreased its speed. Anyway, the SMART-BURN issue aside, looks like the drive used CAV from ~18x-34x.
Thanks for the help all...