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Just a few thoughts come to mind.
The colder your plants are, the slower they'll grow. At this point, colder = better. Move them to the attic or porch?
Once you've laid down the bottom layer of straw bales, you're not going to gain any additional solar area no matter what you stack on top (exception: mirrors).
Which reminds me, don't you have a stack of old plastic mirrors? Perhaps it's time to build a solar oven for your garden.
There's one thing I learned the hard way is it's much better to throw out seedlings than it is to plant them too close together.
Good luck!
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