If you have it off the rifle, pull the set trigger and watch the sear surface on the firing trigger to see the engagement. Sounds like that would have to be the problem area if, all the spring are intact.

Frank

looking at the way it is working and comparing to the Dehass drawing on page 238   springs # 9 and 10 seem to be working ok.  There appears to be enough tension from the "set trigger spring"  #9 to make the trigger 'flip' if you pull and release it.  like wise, with the main spring down tight and both 9 and 10 under tension, pulling the back trigger causes both the first connecting lever (14) and the sear (15) to work.  It seems to me that the nose of the sear (14 is not catching in the notch on the front "firing trigger" (13)  I very apprehensively pushed out the pin the #15 'sear pivots on and dropped the sear out fr examination.  the "nose" does not to be chipped or unduly or unevenly worn.

I had the same issue with my Emil Bartsch rifle.  Make sure all of leaf type springs are parallel to the left and right sides of the trigger bar or barely more toward the outside.  Mine worked fine after adjusting the spring position.  You may not get a much of a perceptible change in trigger weight just more or less trigger movement before the rifle fires.

The trigger on my rifle is extremely light, just touching the trigger from side is enough pressure to fire.  Adjusting to the heaviest possible there is now a little bit of travel before firing, but still too light for me.  Matches are shot in the winter here and cold fingers need to be able to feel a trigger