Also Q allows you to cheat. If you whiff a 5A over the opponent's head and use 6Q during recovery, you will get the throw. However if the 5A hits for any reason you will instead get a 5A5C combo which can allow many characters to hit confirm to a bnb.
Are you sure of this? It doesn't seem right (in my experience or in theory). For that to happen, you'd need to do 5A -> *5*Q, which will result in A+B+C, which is interpreted as 5C if under 100% bar or in a situation where you can't cancel to heat but can cancel to 5C, but it will never throw.
What happens instead if you press 6Q and the 5A connects is that you get a 5AA combo. To exploit this even further, you can mash 6Q -- nothing will happen if you throw successfully, but 5AAA(A) is a very easy hitconfirm (I use this technique all the time with Hisui, pretty successfully)