I'll note the same thing I tell many people complaining about poor braking on their cars, whether they're daily drivers, muscle cars or pretty much anything but supercars. The first thing to do is to run through the new pad / rotor bedding procedure. Yes, I know they're not new, but routine driving will often result in pad glazing, pad buildup on rotors or other braking maladies. The bedding procedure, properly done, often deals with these issues and avoids making unnecessary changes. A benefit, of course, is you already have everything you need to do this and it may well avoid spending money you don't need to. The only thing you have to lose is a bit of your time and perhaps some pad thickness.
Here's a link to Wilwood's instructions:
https://www.wilwood.com/Pdf/Misc/Pad...ding_Steps.pdf