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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Masterworked 1 armor and 1 weapon last night. Still went positive on cores. Don’t be wasteful, and you won’t be short in cores, simple as that.