Thanks for the suggestion - I am not too sure how to go about measuring this, so this is what i did: I put the stock spring in (uncaptured - but with the stock guide rod) and measured back from the tip of the barrel to the back edge of the slide as far as I could possibly pull it back. I then did this again with the ismi spring in it. The measurement was the same (9 5/8 '' for whatever that is worth). Now as far as slide travel during actual blowback, I am not sure how that would compare, but I would imagine it should be pretty similar. The hardest part is that I can't forcibly duplicate it. It fails to go to slide lock at inoportune times when I least expect it. If i load a mag with two shots and fire trying to see if it will happen, it works fine - It's when I am in the middle of paying attention to something else that it usually happens, so it's hard to try different fixes to find out if it indeed the fixes work.
As for Atlanta Arms, I have not used their ammo yet, but am going to give it a try tonight.
As soon as I get a PF, I will let you guys know - maybe that might explain something - now that I think about it, I seemed to have been having more noticible problems with slidelock with the 14# wolf than the 13# ismi (maybe 70% failure as opposed to 30% to lock back) - sorry for all of the confusion, I am really trying to learn as I go!
Thanks again for all the help!!
nm