Did you really remove the shards of the Rebel B Wing from shipments?

That is how this works. They are removed from the priority shipments where they are guaranteed to appear at the same time that they become node-farmable. 

And while these days, with signal data being my biggest hold up between g12 and r7 I always groan a little at new cantina farms, it still goes quickly. And unlike yesteryear you still get some SD income when you're not actively farming it in the cantina. Lots of places will give you small amounts to tide you over. And you'll have a much better Rebel fleet when you're done.