Dave Tooley is correct. I would never give up firing pin fall or put in a softer spring, especially to make the bolt lift easier. We always ensure our rebarrel jobs never have a firing pin spring less than 21 lbs in a Remington 700 configuration. I would actually prefer a 24 lbs spring.
What a lot of people do not understand is "Proper Ignition" is not just setting primers off. You can still be setting off primers just fine, but if your firing pin spring has softened up, or your trigger is dragging on the cocking piece, you can easily increase your group sizes considerably.
Mark.