Loom knitting

I'm a horrible knitter (but I'm good with crochet)

I want to knit socks so I bought a loom - see image. I followed the directions to make the correct size for my foot by measuring around the ball of my foot. I'm using 100% wool.

The completed sock does not go over my arch and won't be even close to going over my heel.

Q: Is this normal? Did I knit too tightly? Is it my yarn? Is it my foot?

The socks fit my daughter perfectly. She 1 size smaller foot.

Do you go back and forth on half of it for thd heal in the pattern?

Can the loom do rib?

I love loom knitting ever since I learned it was banned in some cities during the middle ages.  Never had the hands to make it work.