[James Scott]

I'm not a mechanic, so ignore everything I say!:

Your comment on the rear brakes feeling wiggly - I assume refers to your brake pedal pulsing (?). If that's right, your rear rotors may be warping (mine did, not the fronts!). I got "stock" rear rotors for $70 each @ Autozone here in CA.

I may be off base here, but your comment about brakes grabbing late sounds like something I experienced once when my master brake cylinder was going bad (rubber seal inside was allowing fluid to bypass) in another car. When I braked slowly, I could slowly loose my ablitiy to brake at all (as the fluid bypassed under low pressure to thwart the normal high pressure produced by the master cylinder brake fluid in normal operation). However, if I crammed the brake on, it would work OK (because the pressure of pressing with strong pressure would force the hardening rubber seal in the master cylinder to flare out {like it's suppposed to do} and to push the brake fluid with normal or at least effective force. [Is that anything like you were describing?]

I agree, bleed first if the above is not happening.
[Also, your caliper pistons may be sticking (?)]