EDIT: I do not have FOCH 155 so this post may be usefull only for people who do not have it either. :))
30 critical internal modules - crew members hits in 10 battles. I found it very frustrating. French arty t10 simple doesnt work unless you frequently penetrate skorpion G's etc(very hard). T8 arty has same caliber gun...and yet it didint do the trick for me. I also tried with both MLE AMX's with big guns(50%gold 50% HE). In some battles ive been ending with 5 counted criticals and in some ive had 0 even when penetrating skorpion twice with HE.
STANDARD B is the trick here. Im not a person frequently using HE's, i rather dont, so it takes only mental preperation to change the way of playing. Instead of taking positions to either snipe or assasin some(flank/behind) You need to focus 100% of assassinating low armored targets. 105mm penetration is enough to take down most of tanks from side or back. Just be sure u're in position to unload chosen targets and yolo them with HE sometimes when u're team is losing. In 4 games i had 19 counted criticals and then i switched between arty lorr t8 and standard B simply to lower my frustration after previous fatal attempts.
I think unicums/ebr masters can do it with ebrs, but it takes alot of more skill and work inside the battle then standard .