Disassembled the bolt tonight...firing pin tip looks good, same as the left side in Bill's picture above. Measured firing pin protrusion at .058...made an adjustment and its now .033. Empty piece of brass made a primer go BANG, so I guess that's good.

Might not be the cure, but certainly shouldn't hurt...probably will end up ordering a PTG LA .378 bolt head to see if that fixes the issue, and if not, the next step might be holding my breath and grinding a new radius on the firing pin tip.