They look fine to me. Bad eggs usually start to get wet or mold and yours still look white. You could candle them and check for veins (press a strong flashlight up against the egg and if you see red veins, they are still good.)
I wouldn't worry too much over fluctuating temperatures. My incubator temperature fluctuates between 87 and 89 and so far my eggs are doing fine. One clutch is on day 19 and all eggs have strong veins. Don't add any water to the substrate unless you see dimpling in the eggs. Also, with them being on day 39, you may start to see them dimple a week or more before they are due to hatch.
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