I've been doing a lot of science missions with my DOFFs, and it's become painfully obvious that there aren't enough technological data reward missions offered. I have a Fed whose bank has a row for each of the data tiers, and while I have something in each of the first 3 bank slots, there's a big empty column 4 where my first overflow stack of technological data would be for each tier. Some of the first column stacks aren't even into triple digits, but I've got multiple stacks of the other two types in each tier.
Are we supposed to be getting this data from some other class of DOFF mission, like engineering? I haven't noticed any, though admittedly it's hard to tell right now with the way reward items are a generic icon instead of the specific item icon.