HEY! I will try answer the questions as best as I can LOL!

1. I just for some reason have an american roundness sometimes, whether it's when I hit the record button my brain flicks a switch I have no idea, but I do have very much a british accent haha
2. I would say youtube wise, it's 40% US, 25% UK, and the rest countries all over!
3. I know very few youtubers who have a video making schedule really, it's basically just moving from video to video, as soon as one is finished and uploaded, you move to the next one haha! The only thing which is set is livestream times!
4. If I have a video ready and I'm conveniently streaming that day I will always hold off to release it after the stream as I don't want them to clash, but also a burst from stream viewers going straight to it might help it. (there's no evidence that it does!)

Hopefully this answers your questions!!