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Regarding exhaust smoke:
White = coolant
Bluish = oil
Fuel = black
I think the bad valve seals idea is reasonable, if your exhaust smoke is bluish (=oil). This would also fit with the fact that your cylinder compressions are fine.
You would call the smoke in the videos white also, right?
This is weird, i'm not losing any coolant at all... and the exhaust doesn't smell sweet.