It can definitely take some time to get used to talking to a camera, especially in public, but you’re doing great! Audio is important, especially your voice. Alway try to cut off any noise makers while shooting video so that your voice comes through loud & clear. Other that those little tweaks, ur golden my friend & that big ass GG in a bucket is freakin awesome!! Peace.
may be right about higher ppm keeping pH up, maybe more salts or whatever to hold it. alkalinity may be a thing too, realdutchman has some videos on it but he's talking organics. I'd think the principle would be the same though.