I tried using stormfire and chain lightning from seal pre-nerf actually. I also had ghoul in that set up. But with the CDR, SBoE has like a 0.4s CD. You really don’t have time to maximize said seal granted skills.
As for casting speed - totally agree. But the only way to maximize CS is to use light’s defender so you can get more relevant resists + restless remains.
DPS loss isn’t worth the trade off in my experience.