Bungie can implement a simple algorithm fix. They already know how to power scale based on the character's highest potential, now, just set the algorithm to prioritize what armor piece needs to catch up. This is especially evident when you only need one piece of gear to fully max out, but week after week it's the one thing you DON'T get.
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Also, the drop algorithm obviously knows what light level all your armor is, since I have had back-to-back drops at the end of an activity (Crucible, strike, etc.) where the first was enough to raise my light level by one, and the second already reflected that new light level.