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Sorry @Simba, I'll try and make it less confusing.
The wheel is a front disc wheel (so the drive side is only relative), the higher tension side is therefore the disc or non-drive side. The wheel was built first from the non-drive side and then dished using the drive side spokes; the opposite of what you would do for a rear wheel as the higher tension side is the disc side.
Does your suggestion of a complete rebuild still stand.
Sorry, I'm a bit confused now.
If the drive side is loosening, I would rebuild completely. If it is the non drive side I would only do that side, and that means the drive side is tensioned. When tightening the nds you will dish the wheel and when it is correctly dished you should have the appropriate tension on both sides.