This thread has some useful, but slightly confusing information. Theres a specific way you need to eliminate the valve. You need to plug the distribution block bottom, front port, and make sure the front, front port (facing the front of the vehicle) runs to the T on the axle. Is this how yours is set up now?
Another option, is to get an XJ or YJ distribution block and use that, because they never had these valves, but I'm not sure how the used parts market is in Sweden.
Some guys on here prefer to eliminate the block, T in the front brakes directly to the master cylinder and run an adjustable proportioner to the rear.
If the valve is eliminated correctly, and youre still having problems, i think youre on the right track playing with the pushrod adjustment.