Every pic looks over-watered to me. Cool temperatures make the problem worse. They would do well to get warm during the day, enough to dry out the media a little.
I do let my seedlings in the greenhouse get cold at night, but I'm not sure how much that helps them, if any. They also get very hot on a sunny day, 90+ degrees F. High temperatures seem to speed growth for me, and the roots like it when the media gets almost dry before the next watering.
If you keep everything else the same, try taking your current media and adding a lot of perlite to lighten it up. That will reduce the negative effects of being cold and wet, by making the media hold more air.
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