60 plus hours over 300 chest still no sky core upgrade.

Title says it all. the rng in this game hates me. I have t4 engines wings and cannons from all the knowledge I have gained but can't even make a good ship until I find core upgrades. I trade with players for upgrades for my ship but, in t3 and t4 it's so risky approaching large groups. I'm sitting on 1400 knowledge and can't spend it on anything worth. Please Let us spend knowledge on atlas core upgrades bossa.