I know you said you bled the brakes, but the side that brakes less could still have a pocket of air in it, which acts like a spring, absorbing the fluid pressure without transmitting it to the shoes in equal fashion to the other side.
Your brake pedal should be hard and high. Any bounciness in it, is likely indicating air.
There is a way to absolutely prove there is air in the system. Have a helper pump the brake pedal about three times, full strokes and on the last stroke keep the pedal down about 1 inch. Now you pop the top off the M/C and observe the liquid. Ask your helper to slowly bring the pedal up, very slowly. When the piston uncovers the Compensating port, the brake fluid will want to rush back into the reservoir, forced to do so by the brake-shoe return springs.
In a normal system, the brake fluid will roil in the reservoir, like when water is on the verge of boiling in a pot on your stove.But if there is air in there under pressure,it will unload violently spewing fluid as high as the hood, which will then drip down onto everything. This is why your helper has to release very slowly, to try to contain the fountain in the reservoir.
If the fountain lasts a long time, it is because the shoes have a long way to go, to get back on the stops; ie one or more of them needs adjusting.
Caution; all non-silicon brake fluids eat paint so take precautions and have your cleaning supplies handy with running water; I will not buy you a new paint job.
