They are not the same as 1911 springs from what I was told.
By whom were you told, not that I don't believe you I was just hoping for some first hand experience.
I think it may be a combination of factors, the fact that my piston system seems to need slightly hotter rounds to run reliably in it's current state. Lighter springs may help this. And, that the hiperfire trigger has those toggle springs. I currently have the strongest ones in there which give you the lightest trigger pull, but past half way the hammer actually exerts more force to the primer, also meaning it takes more force to cock the hammer. It may be time to just get the spring kit from JP...
About using multiple kinds of ammo for a match, yea, I would probably agree it is not a great idea. Thing is though, that 3gun falls in a very distant second in priority to USPSA so I really just shoot it for fun. I buy whatever ammo is on sale, so I would like to have a gun set up to handle all types. The change in feel during the match is not enough to cause any problems as long as the gun goes bang every time.
I asked the question by email last year to their parts department.