yeah just tap it forward put your hand back to neutral (let your stick go back to neutral by itself)
then tap forward again.its almost like doing a regular dash. you have to key your brain not to press 66frc. just practice doing 6frc
then when you get that down in input, do the second 6. again like...you have to be fast with the second 6 because you have only so many frames like 4 or something