I dunno, Sigil gameplay actually felt pretty fine to me (a little stationary, sure, but the dmg buildup isn’t too long). At least that’s how it felt on my Valguur vit sigil build (which has even higher CD on Sigil, btw)
So… maybe focusing on acid sigils could be the way to go?
I kinda like the OK acid-sigils-with-PoT-idea Superfluff mentioned earlier 