I would be tempted to go back to the original trigger set by a gun smith at 2.5 - 2.75 lbs. It is one of the better trigger designs and the only one that is more robust and reliable is the John Paul Mauser design. If your rifle had the original Model 70 trigger.

There are too many variables to try to diagnose via the internet.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli