Once you practice plinking, you will plink every Medium in Heavy you use just by muscle memory over time.
Pick Ryu in training mode and practice with:
Cr.MP > Cr.MP > Cr.FK
So your fingers should end up also pressing LP and MK, even though neither should come out as LP or MK.
Note: I use my ring finger to hit the button I want to come out, and I use my middle finger to plink the weaker button.
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