On my channel, go to the “playlist” tab, and you will find a TH10 playlist that has a bunch of Th10 content. Let me know if you cannot find it. Also, let me know if it helps.
Multiple fingers at the same time. I usually use three fingers or four and a witch will spawn at each place. Helps a lot for other armies too. Check out the video I have on my home page that is called “save time with these tricks”.
Against non-max, you can swing some triples, but if you are in war, I would bring some cc troops. Reddit has a sub for Clash, and there are people always recruiting there.