Damn, man, wish I saw this earlier, because I know a little something about this. First and foremost I gotta say a .0000000000000002 temperature difference is nothing. My buddy Rick did some experiments on this a couple years ago and I think - not sure but look up the studies published by Harman and Chung in '09 - we're talking about a minimal effect on the total dynamo coil discharge. I know it's still outside the usual specified tolerance limits but it's a really conservative cap and nothing to worry about practically. The reality is that Herx lost a lot of their business more because of bad press than anything else, and nowadays, the odds of actually encountering any physical destablization is essentially zero since all external plugin interfaces have a built-in failsafe against cascading power eruption (assuming what you have is manufactured after 1995 - if not, then you have worse problems on your hand).

tl:dr; don't sweat it.