Just play the game.
Blue engrams decrypt up to 340, just grind patrols for a bit.
Once over 320 grind The Devils Lair on 320.
The two end blues from Sepkis will drop up to 365.
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Sweet thx
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Any of the strikes selected from the director at 320 will give up to 2 365 blues at the end. I ran Sepkis as it's a quick strike. About 10-15 minutes if you have a good sniper and heavy. The 320 strikes from the strike playlist only drop up to 340 blues for some reason, so just pick your favorite strike from the planet director and go to town.