new rear disks, need more "bite" - any suggestions?

Thanks, guys.

Yeah, the rear drum lockup was a nasty trait of our cars. IIRC, it was a pretty consistent problem for '73+ front disk cars. Right after experiencing this for the first time (as an 18 year old in the 1990s) I felt so vindicated when I read a complaint about this exact problem in a review of a '73 Duster in one of the old car magazines from the family library. So yeah, definitely want the fronts working harder than the rears. :)

After the install and before driving around normally, I did some basic testing of the brakes with a few hard-ish stops and but after reading the instructions from @JoeSBP I'm sure that I didn't bed in the pads properly. Is it fair to say that starting over with fresh pads would be necessary or is there any way to salvage the ones I've been driving on? Can the rotors be salvaged?

As for proportioning valve, MC, etc, it's all stock '73 Mopar stuff. I'll look into some upgrades there.

The advice is greatly appreciated.