Knitting Tutorial: Joining Stitches In the Round with a neat, easy and invisible technique. Just make sure that your stitches are not twisted on the needles before joining. GOID Idea for joining in the round Should be a better join solution.
Been sewing for years and I still have a brain fart when it comes to tension issues. Now I remember with this neumonic which applies to the needle tension. Thread lies in top.tension to tight Thread lies on lower.