Yeah, no. You're using rifle primers. The firing pin springs are what they are. SRP are designed for the higher pressures and harder pin strikes from a rifle round. The cup is much thicker. I think you're lucky to be getting 90%. I would pull those rounds down and reload with the proper materials.I came into some Remington 7-1/2 small rifle benchrest primers. I'm getting about 90% to fire first time through in my carbine. Of those that fail most light off on a second pass.
Any ideas how to give the firing pin a bit more force to set these off more reliably? Is the 1095 firing pin spring stronger?
All the Best!
Just because you can do something, doesn't means it's a good idea.