I would ditch the ACE and try something else. I know it works for some people, but I don't like it. Conner (80 lb) gets two Xanax and wears a thunder shirt. it isn't perfect, but he mostly just goes to a safe place (which changes) and shakes. There are other drugs if Xanax doesn't work, but I would definitely try something other than ACE. The thunder shirt doesn't work for all dogs, but if I get it on him before the thunder starts, it really helps. We have managed to avoid the big fireworks shows in the two years he's been with me, so I'm not sure how well it would work for that.
Good luck, it is terrible to watch them go through this.
And I am sorry to,hear your Minerva is gone