Even if you have a few spare your left in limbo as to when you use them. What if your next two powerful drops in the same slot but you infused on the first drop. It's a waste. Until your drops are at the power cap it's a flawed system I believe.
And you can rarely use them to actually master work anything. I hope this comes across as constructive criticism as that's my intention.
Cheers
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I kept one great roll per weapon an put in the the vault. Now when I get powerful drops it doesn't matter I just infuse like for like and wouldn't ya know it already 700 an still have cores. Now mind you not all infusion was like for like in my grind. Sometimes I did it cause it was fun an I said F-it, I'll just get more cores later. It's about balance. There not changing it. I never have more than 50 but no less than 2. It's a game play. The only time masterwork armor is useful(noticeable) is in comp.