Brakes have me baffled!

AdamR said
How are the brake lines ? Do you have a swelling line ?

Maybe a bad adjuster in the rear brakes. Try replacing the hardware. Its cheap.

I've got new braided hoses in the front (from Wilwood), and I think everything else is solid line...? Is there any other rubber aside from what used to be on the front brakes?

The adjusters are working, I checked that. The rear brakes are tight.