Sounds like you need to go back to the old firing pin spring. To add, there is no advantage in going to a heavier spring, all it will do is give you a heavy bolt lift, and possibly a harmonic problem which will affect accuracy. The factory Savage spring is already to heavy from the get go. I have never had any ingnition problems with any type or brand of primer with a factory and much lighter spring. (Actuly most of my savages have lighter than factory spring, and have never had a problem even with mag primers my 6x47L never has had a problem.) Sounds like you have a firing pin purtursion problem.
You could adjust the sear engaugement on the trigger, and possibly fix the problem, but I would get rid of that heavy spring.
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