It goes straight up when you jump up, that is a good sign. It is normal for it to tumble a bit when falling if you stop the motors.
In that regard, I didn't really see anything wrong in the video. Jump up to just 3 feet. A slow lift off is difficult, and you must NOT correct roll/pitch until it is up off the ground.
If you understand and accept the risk, I would put on a heavy coat for arm protection, and hold it level with my hand while starting a hover at lowest power. That will tell you if it is close to correct. It is probably best if you set yaw PIDs all to zero before doing this test, else when you hold it, you must hold it in exact yaw position it had when first giving it power.