Can you pour a flood coat thinner than 1/8 inch?

No. The table top epoxy is used for flood coats, and it will always self-level to 1/8 of an inch.

Although the seal coat is technically thinner due to its paintbrush method, it isn't meant to be the final coat for anything but a vertical backsplash.

Anything thinner than the self-leveling flood coat will be inconsistent and provide inadequate protection.