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Don't flame me for saying so, but I've always found WWB ammo to be hit or miss (pun semi-intentional). Both I and a few shooting buddies have experienced too many FTF (failure to fire) and FTE (failure to eject) with WWB for it to be pure coincidence. The problem seems to be more prone to new guns in which the springs are still relatively tight. However, both my buddy's well worn P226 and my 1994 P228 have been having problems with the slide not locking open on empty mags (using various mags) when using WWB; changing ammo rectifies the problem. Only thing I can think of is its just under-powered to the point where its not cycling the slide far enough to lock it.

Having said all that, most of these issues were all experienced with Sigs, though there was an XD9 and a Glock 23 that experienced the same problems. I'd try changing ammo and try it again. Sometimes running a few hundred rounds of something a little hotter (Speer Lawman?) will help with the break in. After that you could probably run WWB without an issue.