  F-theory GUTs provide a promising UV completion for models with approximate
gauge coupling unification, such as the (non-supersymmetric) Standard Model.
More specifically, if the superparters have masses well above the TeV scale,
the resulting imperfection in unification can be accounted for by the, in
principle calculable, classical F-theory correction at the high scale. In this
paper we argue for the correct form of the F-theory corrections to unification,
including KK mode loop effects. However, the price of compensating the
imprecise unification in such High Scale SUSY models with F-theory corrections
is that the GUT scale is lowered, potentially leading to a dangerously high
proton decay rate from dimension-6 operators. We analyse the possibility of
suppressing the decay rate by the localization of $X,Y$ gauge bosons in higher
dimensions. While this effect can be very strong for the zero modes, we find
that in the simplest models of this type it is difficult to realize a
significant suppression for higher modes (Landau levels). Notably, in the
absence of substantial suppressions to the proton decay rate, the superpartners
must be lighter than 100 TeV to satisfy proton decay constraints. We highlight
that multiple correlated signals of proton decay could verify this scenario.
