Remember that a 335 and a 321 will have no difference at all on a level 30 enemy. Or even a level 32 enemy. At level 33, you will see a difference, though.
The first two digits tell you what light level your weapon is 100% effective against. After that the impact delivery falls off significantly.
So, unless the next raid has enemies that are over light level 33, there is no reason to buff a weapon any higher than 339.
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Exactly. I don't understand how people can't get this.