Pallas's miner is still running 40Mh compared to the 18Mh on SPs miner.
You can reach 20 on the 1070 if you +100 on the core and +800 on memory and use -i 32 as intensity. #4 will have more speedups.
Yeah you can always mine faster with OCs, everyone OC's differently though. I don't know why people started quoting OCs as stock numbers, but they aren't representative of what everyone can get.
Pallas's numbers aren't OC's as far as I know, which means they can be even faster.