- AR = Approach rate, it determines how fast the fruit will fall. the bigger the number the faster the fruit will fall, max AR is 10 (11 if use DT as far as i know)
- CS = Circle size, it determines the fruit size the bigger the number the smaller the fruit will be, and as i said before the fall of the fruit velocity are determined by AR
- I'm afraid i don't understand what u mean, but in CtB if u miss a fruit then say good bye to ur pp (FC is a must if u want to get a good amount of pp)
- If it's comfortable for u then just use it, although it's a little bit too flashy for me..
- I don't have an answer about this one because i never play it with such mod, maybe others know about this..
If you want some reccs then i suggest you to just go to beatmap listing, set mode to osu!catch and click the "recommended difficulty"
Hope it helps you