The alien science pack has a rocket capacity of 1.0k stacks.
Which makes it impossible to export through rockets in an automated way.

Also I really think that the "Power sticks" should have a higher rocket capacity as they probably don't weight 200 kg each

Uhm, yeah, about that.
I've never actually bothered to give the items any "weight", so what the game had in mind it gave it to em.
I'll update the mod once I add the weight attribute to all the items.

ah, well at least it's not like rampant arsenal in which many turrets have like max rocket capacity of 72. A completely random number which makes them incredibly annoying to transport.

So it's not a big issue, just if someone wants to export something but in most cases it won't affect players unless they do weird things like I tend to do

Version 1.3.2 now gives all items weights.
Before that, it was determined by its prerequisites, which is also possibly happening with Rampant Arsenal.