I’d avoid energizers with electrostatic headphones entirely and go for a dedicated electrostatic headphone amplifier.
Energizers are a compromise at best (subject both to the limitations of the amp AND the foibles of the energizer itself) and most eStats are resolving enough that I wouldn’t want more transformer ringing in the chain than was absolutely necessary (none is preferable … and tolerating more than that would have to be due to an absolute budgetary constraint and no option for other headphones).
Even the basic Stax amps and/or Woo GES will do a better audible job than any energizer I’ve heard. The KG stuff, if you can find something that fits your budget, is better still.
(The “problem” with Schiit amps and most of the eStat energizers is as much on the side of the energizers as it is on the amps.)