  We re-examine the problem of parity violation in single field inflation. We
look for a systematic way to parametrically approach the scale at which maximal
parity violation occurs, which is where we expect to find the presence of the
Chern Simons instability. We do so by considering possible realizations of the
effective field theory of Scalar-Tensor gravity, which could offer a rich
phenomenology. The gravitational action is extended to include derivatively
coupled interactions which, by means of a disformal transformation, are scaled
by negative powers of a small parameter which is identified with the graviton
speed. This results in suppressing the cutoff scale of the effective theory
leading to parametrically large chiral tensor fluctuations. We conclude that a
change in the physical description of the system is necessary in order to
maintain sufficient parity violation as well ensure stability of the modes.
