Snips, I find that if you fight against a good player 32 invisible allows your opponent to see that and poke out. I find that 32 is better because it doesnt show the stop invisible animation. But if you use 32 invisible sometimes, it will throw off your opponent and you will get a combo.
Anyways back to the topic. 32 =0 frame recovery, 321= 0 frame. So use this to your advantage, one example is 32 stop then do 321. If your opponent think you are gonna do something like 321 acid hand, then do 321 321 acid hand.
stand 1 works to because it is again 0 frame recovery. so do something like 1, 1, 122 ffb BNB or 1,1,1221. Remember 1221 is safe on block.
Remember down 4 is BEAST, i think down 4 acid hand is the best move in the game mix up lol. Your hit box becomes a little bitch, and its a low to mid mix up.