“Double loop on the left” or “double loop away from the body”. I don’t know what direction you all are talking about!
The doubled part of the string (assuming you’re wearing it on your middle finger) touches your index finger when your hands are closed. Or else it’s weird.
At minimum, I have to have the “doubled” part twisted before I snug up the knot. But more often, I use a special finch-head knot that someone (Waylon?) taught me way back in the day. I use it on all my yoyos.
When snugged up, the string has to be just past the first knuckle, and the single string coming out of the slipknot has to be perfectly centered. Whenever possible, the knot on the other side of the finger should be perfectly centered as well. I can survive if it’s not, but I get pretty annoyed.