20.29Level 13 — dominant scales without overthinking

For D7: you could think D Mixolydian.

G7: G Mixolydian.

C7: C Mixolydian.

F7: F Mixolydian.

But that is four scale switches.

At tempo, better:

target the 3rd/7th and use surrounding chord/diatonic tones.

Scale labels are secondary.