Maybe I have no business saying anything considering I slid my bike out in a slow speed turn on Christmas day. haha I just noticed in the video that you turned wide then wrote that you thought you should have leaned more. That may or may not be true. Just keep this in mind: The LESS you lean the bike, or the less /time/ you lean the bike, the more traction it has and the faster it can go. A racer, for example, leans their body into the turn so that the bike itself can stay a little more upright. (If you consider dragging a knee more upright!)
To avoid running wide, you might just need to turn in a little later and a little quicker. Point the bike and go. If you turn early and slow, you might need to lean more and for longer. Then if you find yourself running wide, you might want to lean it even more. Trust me, you don't want a 90-degree lean angle!
It's worth practising leaning more, but also leaning less. Unless you're on a dirt bike.