Carrots need a sandy soil, which makes it loose enough for them to expand and grow in the pot. I also tried a compost-cocopith 50=50 combination for my carrots and radishes, and while they grew, they were misshapen and not as fat as they could have been. So I removed some of the potting soil and mixed in some sand (washed and dried and sifted) and some rice husk ash, or even wood ash. Both these make the potting soil loose, and the radishes are growing better this time.
You can wash the sand by putting it in a pillowcase, and holding a pipe into it until the water runs clean.
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