I honestly can't believe I haven't ace the AMX M4 51 once while 3 marking it.
I am aware that it has one of the higher ace requirement, but dam it suck not being able to ace it, before 3 marking it.
On a side note, I'm not a 3mark enthusiast, but I've been recommended by clanny to watch more twitch stream instead of youtube lately, and luckily was able to catch Daki streaming AMX M4 51 gameplay at the time, showing the strength and weaknesses of the tank, and most importantly his map awareness and decision making skills, which really helps to improve my gameplay.
Source: https://www.reddit.com/r/WorldofTanks/comments/tvorjg/3_marked_amx_m4_51_without_an_ace_tanker/