Have tested with my ASUS RT-AC68U with ASUS PCE-AC68, so now you know what's is wrong Does the Netgear R7000 Night Hawk works well with the Broadcom Turbo QAM in the first place?
As for the ASUS PCE-AC68, please download the latest PCE-AC68 utility 2.0.7.1 from ASUS network support and give it a try again.
Direct Link ~> http://dlcdnet.asus.com/pub/ASUS/wireless/PCE-AC68/UT_PCE_AC68_2071.zip
2.4GHz ~ connected @ 600Mbps
5GHz ~ connected 1300Mbps
As for the ASUS PCE-AC68, please download the latest PCE-AC68 utility 2.0.7.1 from ASUS network support and give it a try again.
Direct Link ~> http://dlcdnet.asus.com/pub/ASUS/wireless/PCE-AC68/UT_PCE_AC68_2071.zip
2.4GHz ~ connected @ 600Mbps
5GHz ~ connected 1300Mbps
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