Del, 1st thing is to map a key to Manual mode and use it. I recommend switching to manual mode on every landing. When it get's 6-10' high, hit manual, bring it down your self then hold the left stick down AND to the left corner to kill the motors. While in a perfect world you wouldn't have to do this, there is nothing but good in learning to fly manual mode, which is also called 'Altitude Hold'. It would have saved every example you provided and likely more in the future.
Just my .02 opinion, and still flying the original props since June when I received Solo.