I have the same lock. I think it might have spool pins because it gives you alot of false sets. There is also quite a bit of play in the plug.
Try using VERY slight tension with the wrench and gently rocking the pins with a C rake.
http://www.lockpickshop.com/p-MP-09.html
I can open mine like that now in about 10 seconds.
Hope that helps.