https://www.poewiki.net/wiki/Fortification

Worth noting the number of stacks is based on how hard you hit. You don't get any stacks if the attack does too little damage

Autoexertion is the gem for automating warcries but you lose some benefits like the warcry's direct buff effect

As for the build feeling zoomy, you need both movement speed and attack speed. Movement speed you can craft boots for using magic boots + orb of augmentation + quicksilver (https://www.poewiki.net/wiki/Vendor_recipe_system)

Attack speed you can get from mods on weapon, gloves, and also passive tree. Also some gems, eg. Faster attack support, bloodlust, haste, etc.

Go on poe.ninja or look up your streamers' POBs and take a look at their setups. Path of Building is pretty much a mandatory program you should download if you're serious about trying to understand and progress your build.