  The class-S theories of type $E_8$ were analyzed in
\cite{Chacaltana:2018vhp}. The basic building blocks consisted of 49,836
isolated SCFTs (three-punctured spheres). In 244 cases, there were undetermined
levels for the flavour symmetry current algebra. Here, we rectify that
omission. Using S-duality and nilpotent Higgsing we compute the levels of 235
of the 244. There remain 9 three-punctured spheres with unknown levels. Along
the way, we provide a detailed discussion of the Drinfeld-Sokolov reduction of
the VOA, which captures various features of the Higgs branch RG flows arising
from giving a VEV to a nilpotent moment map.
