Confused on PoB dps/dmg increase - actually an increase?

The two pics are comparing Reckoning vs 6L cyclone.

Trying to figure out if it's worth swapping my tree from A to B, where:
A) path along the bottom for Dismembering
Impale: ~900k, Combined Total: 5.18m

B) path along the middle for Swift Skewering
Impale: 1.85m, Combined Total: 4.88m

So here's the confusion: on Reckoning, despite gaining ~900k impale dmg, I lose overall damage? Which is somewhat a result of losing crit multi, but if I just compare Swift Skewering alloted, to not allotted, it's ~530k impale dmg vs 79k total dmg. Combined Total dmg is unaffected by impale dmg?

But with Cyclone, it's very clearly Total DPS + Impale DPS = Combined Total DPS, so with Reckoning I don't understand why that's happening / what I'm actually gaining.

Accuracy affects the way DPS is calculated.

Your chance to impale also affects the way the DPS is calculated.