Here's what I have for a Phoebe feature map so far:
Click to view attachmentThis uses the Cassini December 2005 map release PIA07775. There was a subsequent cartographic map release (e.g. PIA07795) that has some higher resolution imagery. However so far I've unable to find this version in a clean (unlabeled) cylindrical projection. The difference in the imagery is particularly noticeable around the craters Amphion and Eurytion.
Steve