Former G2 user, so I know what you're looking for.

Zebra Sarasa Push Clip, also available in 10 packs on Amazon for a bit less depending on your thickness. I prefer .4mm or .5mm. No skipping, dark black ink without bleeding through, and a clip that's fun to mess with absentmindedly.

Honorable mention goes to Uniball Signo RT1, Pentel Energel RTX, and the Pilot Hi-Tec-C.