  We revisit a class of simple single-field inflation models and demonstrate
that they can readily produce a negligible tensor/scalar ratio $r$. Motivated
by recent work suggesting the need to introduce higher order operators to
stabilise unregulated potentials, as well as by work indicating that such terms
can have significant effects on observable predictions, we explicitly construct
corrected versions of the quadratic hilltop potential that are motivated by an
effective field theory expansion. We employ Markov Chain Monte Carlo (MCMC)
methods and optimization techniques to sample viable models and minimize $r$.
We find that such potentials can readily lower $r$ values below projected
CMB-S4 sensitivity, while still remaining within observable constraints on
$n_s$. Furthermore, we find that the minimum $r$ reached for each order of the
expansion considered is well-described by a power law $r_{min}(q) \propto
q^{-B}$ before asymptoting to a value of $r_{min} \sim 10^{-11}$, where $q$ is
the order to which the expansion of $V(\phi)$ is carried out.
