1le upgrade done, More Rear Brake Power now?

[stangs400]

so I just finished the brake upgrade on my 71' TA, using the wilwood dual piston d52 calipers, bled the front and took it out, and the drivers rear tire locked up before stopping, so i take apart the rear and readjust both drum brake (both are all new), and take it out again, also rebled the fronts thinking there still might be air in the line, nope. The rear tires are not locking up anymore, but they have way more bite than the fronts do and lock up before the fronts. Do I need an adjustable proportioning valve?