4x4lo8o
Warrior
I don't like to use it after d4. d4 on hit gives you enough advantage that you get a free jump in, a free throw attempt, or you can use b312 and if they try to press anything they get hit. If you think they're going to block you're better off going for the throw or taking your jump in and if you think you're going to hit them f23 isn't really the string you want to use.After jip or after a d4 hits are the times where it's most guaranteed. After d3 or d1 hits is good too if they don't poke back or interrupt you with something else. Basically, any time you think they will hold block.
After jips it's alright, but after jip you can go for 22 which has all the same advantages as f23, plus it links into normal shocker so you don't have to use meter and you end the string with the low.
I use f2 after d1 and d3 or when I teleport and know they can't react/punish but also will be able to block before I can land a superman or b312 punish. Also, after b31 like I said above or just in other situations where you think they're going to block