need recommendations for brake shoes and wheel cylinders

no no no my friend. you want the front to lock up before the back. when the rears lock up first the car becomes unstable and it likes to swap ends.

Yes, you're right. 80% of braking efficiency comes from the front brakes. A rear brakes lock-up turns the car into a sledge.
Nothing better than a perfect balance between front and rear brakes, but it's sometimes hard to obtain with disks in front and drums in rear.