I would mention Traz is not producing a group of troops all at once matching the percentages. Traz creates troop on a one at a time based on percentages, (very fast) when you click collect. So say you have three barracks and can get one hundred troops from Traz.
Selection number one on A B C each is a 33.33% chance, but it randomly chooses A
Second troop selection 1/3 A B C it chooses C
third troop 1/3 chooses A etc Traz does that 100 times and yu got your hundred troops..
So you can get any number of each troop. The average will average out over time to 1/3of each. but remember all previous choices do not affact the next choice. ((The more barracks one has the more skewed the results can be... because of the way the troops are chosen)
So a person could end up with 62 of A 12 of B and 26 of C after a bunch of tries..and that would be OK working fine.
The best way to really use Traz is make one kind at a time from one barracks., or just two differetn barracks*. Saves space, and messing around.
If you do not believe it works this way. Not my problem. LOL
* more than one barrack of a kind is of little use in relation to Traz You may want more for other reasons..?