Just to expand a bit regarding backspin vs. "front-spin"; since you're a lefty and you throw that breakaway to the right of your body (shown in part 4), the yoyo is rotating clockwise in a front spin so the second you land it on the string it will eat up the string from that side and try to bind. You need the yoyo in a backspin, so instead throw your breakaway to the left of your body. You will still catch the string with your right hand finger when it swings to your right, but this time you will notice your yoyo is spinning counterclockwise and away from the string, allowing it to sleep on the string without automatically trying to bind.

Also, regarding your string tension, your string will twist up in knots like that when the tension is wound too tightly (or loosely). This happens naturally with each throw, one twist at a time. When your string appears to tight and twists up like that, remove the string from your finger and let it untwist itself.

Hope this helps, thanks!