Can any suggest ideal tyre pressures for a lightly loaded Fabia VRS with Toyo Proxys T1-R 16 45 205?

34 psi in the front and 32psi in the rear.

You might have to experiment around these figures, particularly the rear.

I ran 35/33 and the fronts still looked a bit baggy.

35/33 worked well for me. Just experiment and see what you feel is best.

Can any suggest ideal tyre pressures for a lightly loaded Fabia VRS with Toyo Proxys T1-R 16 45 205?

Ultra low profiles can be a hard ride, especially when lowered. I drop to 31/29 which makes the ride just a bit more compliant.