Concentration is based on Constitution. Not that Cyril's Con is any better than his Wis. Both are a 10. Or is Wisdom somehow relied on for psionic manifestation in other ways?
RE: whether the hardcover has detail on what displays are, not really. I don't have the book in front of me so I'll have to confirm when I get home, but from comparing the d20 SRD to the hardcover last night, the info on displays is waaaaay more in-depth in the d20 SRD than it is in the book. I think the book just had a very basic list, in the preface to the Psionic Powers section, that stated what the names of the different displays are. The book didn't seem to offer much description for how the displays manifest. The SRD had a lot more info on that front. Personally, I'd roll with whatever the SRD has in this area. I didn't see anything untoward in the SRD and the detail there was helpful, more so than the hardcover.