Okay so it was my fault, 1 of calibers was non-original replacement caliber and its piston was different size than original caliber. So i have to swap pistons between 2 calibers and now front brakes are fine but i have to push brake pedal almost in floor until car really stops. I think master cylinder is not powerful enough to supply full set of 4x4 cosworth brakes.
Now it would be nice if someone can recommend some upgrade master cylinder + servo package.