Your data kind of confirm in a way what is my general idea of loot drops.
Looking at that, titans loot is by far the best in the game. And that’s what i always thought.
More for 3* material, sure, but still overall the best.
Now, i give up on titan loot long ago (alliance shifter) still my numbers are much less far then yours.
For me every loot you get is part of a collective RnG. Every slot of possible AM count on that, so the only thing that really help is getting more slots as possible overall in the game no matter from what.
So if you are like me that totally can’t have 4* AM from a titan (too low titans to receive it) i recover that loot from other sources.
Long story short, i get more 4* AM then you from other loots rather then titans.
The real loss in this kind of “tactic” is 3* AM, which i totally get a lot less then before (but we don’t care anymore about that)
This is logic, otherwise newer players couldn’t even remotely keep up the pace with seasoned players chaining 14* everyday.