Hey guys this worked for the whole fireteam I was on. So I assume it a "thing".
When running the raid have [b][u]only your highest [/u][/b] level gear in the inventory, and if RNG is good you will get that light, or better. Try it before you get crazy.
Example - Light level 314 gun is the lowest you have than; in theory, you will (RNG hopefully ) get 314 +...
Edit- correction of Atack values.
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Go run a raid in Kings fall and I bet you my life as a servant that you will never get anything below 300.