For jab to cr. forward, it’s a timing thing. Plink it. Also, I prefer using 3 jabs to cr. forward.
For jab to ex MGU, make sure that you LINK into the jab that cancels into the ex MGU. If you CHAIN it, you can’t cancel into a special move.
Whats the difference between a chain vs a link?
Chaining is when you mash on jab, and it combos into itself. Linking is doing moves that don’[t chaint into eachother in a combo.
For example: Ryu’s cr. LP > cr. HP is a link, Dee Jay’s cr. LP > cr. MK is a link
It allows you to do stuff like cr. LP > cr. LP xx EX Machine GUn Upper, you just have to space out the crouching jabs to make them link instead of cancel.
cr. LP > cr. LP is 2 frame link. cr. LP > cr. MP is one frame. IIRC
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This video breaks it down to the bone.