There is a huge noticeable difference between the amount of units that drop if a comparison is made between mother to yamato or deus.
Everybody receives tons of units whether its 1 slot to 4 slots that have either yamato factor or deus factor during those respective UQ, but for some reason this doesn't seem to be the case with mother where units with mother factor become especially rare. Also, each UQ whether it's Yamato, Mother or Deus had their own time to shine in the UQ rotation, but even with the same time there is a huge difference between units that drop with factors.
In 2 weeks time of Yamato in UQ rotation, a player can get units from 1s-4s with... -50+ yamato factors
In 2 weeks time of Deus in UQ rotation, a player can get units from 1s-4s with... 50+ deus factor
In 2 weeks time of Mother in UQ rotation, a player can get units from 1s-4s with... -10+ mother factor
Can there be some sort of balance/buff to mother when she makes her comeback into UQ rotation where she drops more units that have a higher chance of having mother factor?
Last thing is that there is to much demand for units with mother factors, but there isn't enough supply for everybody to buy so...