Toby, as editor of a fishing magazine it would help all of us if you had better information on C&R mortality for striped bass.
Here are some articles.
Striped Bass Catch-and-Release Mortality Study | Careful Catch Maryland
http://www.laterallineco.com/fishing...hards_1996.pdf
http://www.fws.gov/northeast/fishery...rdetal2005.pdf
I believe the average C&R mortality is 8-9%. That includes lots of badly hooked and handled fish. The lower end for lip hooked non-bleeding fish is more like 2-3 % although it rises quickly in warm water.
Gut hooking fish also raises mortality quite a bit, and guys fishing bait with J hooks catching larger fish creates mortality rates closer to 20% (or higher in deep summer when waters are warm).