The key when calculating which to use where is to first calculate modal damage with and without damage bonus. Modal damage is 2x base plus bonus, divided by delay. At level 52, you have a 1h damage bonus of 9, so they work out like this:
VGLS:
onhand: 41/20 = 2.050
offhand: 32/20 = 1.600
LSoY:
onhand: 33/17 = 1.941
offhand: 24/17 = 1.411
OLSoS:
onhand: 55/34 = 1.617
offhand: 46/34 = 1.352
Since onhand hits will occur more frequently then offhand hits (everything else being equal, you have to make a DW check for each offhand attempt prior to even rolling for a hit), you want the highest modal damage in your onhand. Then the highest offhand ratio that's left in the offhand. Note, that usually, this will mean that faster weapons will have better modal damage in the onhand (due to the damage bonus being factored in), and the highest raw ratio (which *can* be a slow weapon) will always do the best in the offhand.
In the case of these three weapons, this isn't the case at all. Your fastest weapon is the second best in both on and offhand modal calculations, so it makes this a bit more difficult. You could play it safe and put the VGLS in primary and the LSoY in secondary. However, you'll note that there's only a 0.109 difference between the two weapons in the main hand (a 5.6% increase in damage from the LSoY to the VGLS), but a pretty significant 0.189 difference between them in offhand (which works out to a 13% increase in offhand damage, about twice as much).
The key then is to figure out the real ratio of onhand to offhand hits. I'm actually not that sure about DW ratios. But based on the numbers generated here, if you get a DW swing more then 50% of the time, then put the LSoY in primary and VGLS in secondary. If DW rate is less then 50%, reverse them. The idea is that you're adding up both on and offhand swings. The modal damage calculation already takes into account delay, so we only need to worry about DW rate. It's the "weight" provided to each side of the equation. You can even think of it as a constant if you want:
(1*(onhand modal)( + ((DW rate) * (offhand modal)) = total modal.
Example: 75% DW rate would yield:
VGLS primary, LSoY secondary
(1 * 2.050) + ( .75 * 1.411) = 3.108
LSoY primary, VGLS secondary
(1 * 1.941) + ( .75 * 1.600) = 3.141=
Example: 25% DW rate would yeild:
VGLS primary, LSoY secondary
(1 * 2.050) + ( .25 * 1.411) = 2.402
LSoY primary, VGLS secondary
(1 * 1.941) + ( .25 * 1.600) = 2.341
Somewhere in between these two numbers will be the exact DW rate point at which you'd want to swap the weapons.
Someone else will have to provide the DW swing rate number. The only character I have with DW is a level 13 rogue that I started for fun and haven't played in like a year, so I'm about the worst person to ask about it. With these particular weapons though, it's the determining factor for deciding which weapon to put where.
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