My husband has encouraged me to find a hobby that I can get into for years now. I just had our second baby and I finally decided to try loom knitting. I love it! It’s something that I can do while nursing my now seven month old with little difficulty. Here are some of my projects:
(Any feedback would be appreciated!)

After years of trying other crafty hobbies and abandoning projects halfway through completion, I tried loom knitting and it's stuck!! I've made a 10 stitch blanket for the cat, a cable knitting beanie, and now...socks!!! I'm very happy 😊

Anyway, on to the question in hand (or foot). I made my first pair of socks on the 56-peg orange His & Her Sock Loom, using the toe-up video tutorial from Goodknit Kisses (which is awesome btw). I knit halfway between flat knit and U-wrap (L-wrap?), using Rico Superba Cashmeri 4 ply sock yarn. I did the German Short Row heel using 9-10-9 spacing.

However, whilst the sock feels fine on, it's very tight getting it on over my heel, as shown in the photo (2).

So my question is, how can I adjust the fit? Do I add extra stitches to the body of the sock opposite the heel (terrible drawing #3) - I have a Flexee Bitty, so could do this, or would a different heel be better? I've looked for video tutorials for loom knitting the Fleegle heel, but can only find The Loom Muse, which I didn’t understand, and The Lopsided Crafter, who says it's on her list to do!

Help!