I looked at the 4 photos,I see a growth tip on all 4. I don't see any blind ones.I hate vermiculite for seed starting- too wet. Vermiculite is great once it's in its final transplant home, if that home tends to go dry too quickly, like grow bags.
I hate domes, used one and that was the only time I got damping off. No way for air to circulate inside a closed dome. No circulation plus high humidity= damping off.
I don't even use a heat mat here, we start seeds when it's like 36C outside. Same time of year as you, but we are getting ready to grow for the winter season.
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