Hmm, not sure what you are seeing with flickering. Perhaps view it on youtube and make sure the 4K version is selected? Low bitrate can make YT videos look odd.
Flying slowing, with a shallow camera angle, can be a challenge. With stick time you will improve. I believe someone mentioned using a 2S battery in the Pavo20 Pro for slower flights and they are absolutely right. With 3S, the Pavo can have quite a bit of power. In 2S she is far more tame - the quad feels noticeably different in 2S. Some of my favorite cinematic flights have been done with a 2S pack