Minimum level brake hardware for adequate stopping power?

[CNC_Geek]

I fully expected to use the OEM brake booster on my street (no track) 818. Perhaps the first generation chassis allowed room for the booster but mine (#340) does not. This issue became my first introduction to the build forum. While searching for information on the brake system I learned that most people were afraid to drive their car with the OEM brake hardware. Recommendations involved better pads, H6 larger discs with caliper spacers, and smaller master cylinder diameter. I have done all of these and I can not lock up the front wheels much less the rears. This setup is just barley adequate for the street. My rear calipers are single piston and the front are 2 piston. I'm really frustrated with trying to make this work on a budget yet $2,000+ for a complete new system is just not in my budget.

What can you recommend in the way of proven (works on your car) brake hardware? Particularly for the rear.