I can confirm that PPNLS payouts with Antpool is not working but PPS is. Also my Freq is 643 & I'm getting an average of 15.4ksol
15.4 KSol = Almost my 3 rigs full of 1080TI and Titan Xp, but less power efficient :-)
Significantly, I'd estimate that overclocked z9 is running at under 500W.