I’d do fluid and whatever the recommended upgrade pads are (if the rotors are in spec) and see what it feels like. You can then fire the money gun at some APs.
Fluid has been done, that did help a bit but it still needs a bit more help. I'm sure sporty pads will be a good next step. I've got a bit of vibration when I brake at higher speeds so rotors also would be good. And while we're there brake lines. Probably not so cheap all in.
I’d do fluid and whatever the recommended upgrade pads are (if the rotors are in spec) and see what it feels like. You can then fire the money gun at some APs.