Just a few suggestion-
1. The Eastern, Balkan, Ottoman fronts should be max level 2 trenches (considering the level 6 1.0 had)
2. The Italians and Western should only be a max trenches
It is anachronistic to see a fully entrenched multi-layer Defense in Depth in the East.
Trench wasn't just one line, it was 3-4 lines with counter-attacking artillery and infantry with heavy artillery in the rear, machine gun nests, pillboxes, strong points etc.
The French Army should start out with low defensive as the Russian and AH armies. With level1 they should get the full defensive equal to the British and German ones.
The ottomans and minor allies should never be able to reach level 3 (or whatever maximum level of infantry prescribed). Again extremely anachronistic.
The British starting army and the German regular corps (but not German reserve corps) should start with a bonus morale in 1914. This is to showcase the superb training and equipment present with the pre war Frontline corps of these 2 nations.
Austria and Germany should start with Artillery level1 researched and have 1 of it each, maybe Austrian guns can have deployment in West or Serbia or Galicia and rest should start at level 0.
The British and German Navies should also have a higher morale than other navies.
Again, quality of warships of AH, Italy, Russia wasn't upto the mark.
P.S.: WW1 Gold is the Gold standard for modeling these things quite perfectly.