We're getting pretty good at killing these NPCs, but they still only drop 300cu worth of cargo. I know the devs are busy making content, so this is very low priority, but still would be nice. Thanks.

Maybe its the way escorts are set up... But ya capellas should hold waaaay more
+1

Well the cargo in Capella convoys have been of the order of textured protein, plasma cannons, and medium cells...

This isn't really a function of the capella cargo size, this is basically part of how the economy works. There aren't very many cases where truly large amounts of cargo are being transferred.

Would be nice to see the old M7 model be used again somewhere in Latos if the Capella and other similar or above class vessels + economy could handle several thousand cu

Yeah but I picture a station that size as being more like a capitol station....