Nice Tutorial.. I loved it!! I like f4 idea.
f1,2 on block vs Cage(Also certain characters) could be a little dangerous depending on the player. Cage can poke Liu Kang faster than Liu Kang can poke him. f1,2 Cage will interrupt with a poke before you even try anything else. Actually f1,2 Ex Dragon would be best vs Cage. Most Cage's will poke after 2 on f1,2. Ex Dragon would catch them, and put a little freeze on the poke after the 2 on f1,2.
Plus Ex Dragon stuns them if it hits. So a free f3, for either chip or normal damage.(Depending on the opponent.)
So basically.. I'm saying f1,2 Ex Dragon can be good depending on the opponents. Some may jump after f1,2(f1,2 two times will catch them). Some can poke Liu Kang before he makes another move after f1,2.
Well... that's my personal experience with f1,2. Every Liu Kang isn't the same.