wow..no kidding your thread went off someplace..
your malfunctions..only with WWB??? how far out is the other brand ammo ejecting out??? consistent area??
as the others have suggested..might change out the extractor spring?? but another thing you might look at..since the failures are ejection..with a couple of stovepipes..might try a lighter recoil spring...just to check and see...
I pretty much set my gun up before really shooting it..I changed out my recoil spring...as I knew I was going to be shooting ammo set up for USPSA production competition so only about 1100fps...the WWB only runs about 1140fps out of my barrel..
I run a 12# recoil spring in mine with a 15# hammer spring..and it will run WWB, Blazer Brass, Remington bulk as well as Corbon, Winchester silvertips and Federal JHP with no issues...
I have yet to have any failures with any factory ammo or reloads with this set up..and I have yet to change out my extractor spring..even though I have a pack of them in my spare parts box..
anyway..love the gun..I have it set up for what i need and it shoots everything I have given it so far..
Here is a bad photo of mine...set up for USPSA production competition with CZ sights, CZ hammer, an action job, SS FLGR, new hammer springs and recoil spring and skateboard tape, a few other modifications ( polish this, bevel that, etc ) and lots of mags..