For those of you who are lazy, or as we like to call it in the industry, efficient, the KGSSHV works with the KGST's BH power supply @ 350V. I'm doing some duration testing right now but there seems to be enough adjustment range on the pot to get down to 0V.
After it's warmed up it settles to around 15-18V, no servo. Might be enough for me to leave it. Also pretty lukewarm heatsinks, reminds me off the vanilla offboard build.