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RE: an interesting journey

If you're right about this (mains impurity), that might be the most likely cause for the edge or glare.

I never had relevant issues with mains purity, although I don't think we have got particularly clean mains here in Belgrade. Thus I'm not inclined to accept that as a cause without further testing.

The buzz-noise-hum could easily be picked somewhere. If the other channel doesn't have it, try switching sides for the 2 heater supply types. If the buzz follows the culprit will be revealed.

If it's mains noise, would it be difficult to filter out some of it? Maybe a filter (cap and choke commercial type mains filter for appliances) would do the trick?
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