Before cutting anything I'd suggest you do the following:
Re-install the original mainspring and leave the other replacement springs in place.(They're usually bad anyway).
Test fire the pistol and see if you're still getting pierced primers. If not the problem is probably with the replacement mainspring as indicated above.
Thomas Jefferson, of Virginia:
"Laws that forbid the carrying of arms. . . disarm only those who are neither inclined nor determined to commit crimes. . . Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man."