I see no evidence of bubbling in the radiator. Before I had done the head gasket, the radiator would purge some coolant when cooling, and I don’t believe that to be the case anymore. I do not believe condensation to be a culprit. I may get a compression tester, just to see how the rings are doing. I believe the smoke to be white, and it certainly doesn’t smell of burning oil, but might as well check.This may have been asked before, but are you getting exhaust gases in the radiator? If you had a cracked head or block exhaust in the rad would be the most likely symptom.
Are you sure that your exhaust system is free of condensation?