Heh, I was editing when you posted to bring up what you said about the Ecclesiast. Yeah, the historian definitely looks too strong compared to it, and maybe too strong compared to the Arcanist as well.
Well, I forgot that my main restriction on the Ecclesiast/Prayer end of things was that it has less Seeds than the Arcanist, but has Sacred Gifts to make up the difference. I'll give him access to a couple more of each when I can.
Should the Historian really be getting full access to these abilities? I think capping the amount of points he can spend on spells/fusillades might be the way to go, since you have dedicated classes to these things now. The Historian seems more like a bard "jack of all trades" than a specialist (with a bit of the binder thrown in, as far as how he chooses his abilities daily). Maybe cap his maximum points spent at 3/4 class level (rounded up?)?
Yeah, the Historian was written as a class with stand-alone access to these abilities. The easiest change is probably nerfing his spell point cap to use the same progression as the Arcanist's Seeds (capping out at 15). At least for use in this setting. He's probably okay as he is when facing up to CoDZilla.
Edit: Take a look at the newly beefed up Ecclesiast.
Edit #2: Added maximum point caps to Ancient Spellcasting and Martial Fusillades for the Historian.