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This is usually an indication of a gap in the insulation above the area with the condensation. This is not a soffit/ridge venting issue. So you need to locate the space above the area with condensation and add more insualtion
I'm not following your latest description. You need to insulate above the area with the condensation. I don't know what you mean by the roof addition. Insulation is only used next to/above heated/conditioned spaces. You don't insulate between the rafters of an unheated space. If this space is below enclosed rafters then blowing in insulation is probably your best bet
I'm afraid your pics don't really help. Like I said before you need to insulate the walls or ceiling of a heated space that is adjacent to an unheated space. I would not insulate between the rafters in any of the pics you showed from what I can see in the pics. A vapor barrier should always be used but only up against the backside (from the perspective of the heated space) of the wall board or lathes where you insulate. Never on top of existing insulation.