You should never swap both weapons, you will def lose dps this way. You have efreeti war spear for this reason. If you have a rsss your best combination with swapping is thorn mh(swapping in spear for bs) rsss oh. Throw rb in range slot. If you ever have a Half a second of time without a weapon in both hands you are doing it wrong. Absent of swapping shiftin is right that the speed and ratio of thorn will not make up for weak backstab dmg( maybe if you don't have haste it will be close).
It's worth noting the proc on thorn is a rune which does generate a fair bit of hate.
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