What concerns me is even after rolling back I still have packet loss on my 5ghz network. I actually have a 350Mbps downstream from my provider, so using 5ghz would be nice....... But alas, it doesn't work as well, sometimes drops and on the r90 didnt work at all. Below is a ping test, latency jumps then packet loss. I am sure it is not my adapter or drivers as it occurs on multiple platforms with varying manufacturers. I should also note, I have about 20+ wireless clients constantly in my household.
tim@element:~/Downloads$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.

56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=2 ttl=43 time=57.1 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=43 time=46.1 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=43 time=50.3 ms
64 bytes from 8.8.8.8: icmp_seq=5 ttl=43 time=44.3 ms
64 bytes from 8.8.8.8: icmp_seq=6 ttl=43 time=48.2 ms
64 bytes from 8.8.8.8: icmp_seq=7 ttl=43 time=44.2 ms
64 bytes from 8.8.8.8: icmp_seq=8 ttl=43 time=56.4 ms
64 bytes from 8.8.8.8: icmp_seq=9 ttl=43 time=968 ms
64 bytes from 8.8.8.8: icmp_seq=10 ttl=43 time=49.9 ms
64 bytes from 8.8.8.8: icmp_seq=12 ttl=43 time=47.3 ms
64 bytes from 8.8.8.8: icmp_seq=13 ttl=43 time=100 ms
64 bytes from 8.8.8.8: icmp_seq=14 ttl=43 time=201 ms
64 bytes from 8.8.8.8: icmp_seq=15 ttl=43 time=98.2 ms
64 bytes from 8.8.8.8: icmp_seq=16 ttl=43 time=119 ms
64 bytes from 8.8.8.8: icmp_seq=17 ttl=43 time=40.7 ms
64 bytes from 8.8.8.8: icmp_seq=18 ttl=43 time=47.1 ms
64 bytes from 8.8.8.8: icmp_seq=19 ttl=43 time=46.6 ms
64 bytes from 8.8.8.8: icmp_seq=20 ttl=43 time=44.0 ms
64 bytes from 8.8.8.8: icmp_seq=21 ttl=43 time=44.8 ms
64 bytes from 8.8.8.8: icmp_seq=22 ttl=43 time=44.7 ms
64 bytes from 8.8.8.8: icmp_seq=23 ttl=43 time=2105 ms
64 bytes from 8.8.8.8: icmp_seq=24 ttl=43 time=1103 ms
64 bytes from 8.8.8.8: icmp_seq=25 ttl=43 time=105 ms
64 bytes from 8.8.8.8: icmp_seq=26 ttl=43 time=45.4 ms
^C
--- 8.8.8.8 ping statistics ---
26 packets transmitted, 24 received, 7% packet loss, time 25081ms
rtt min/avg/max/mdev = 40.775/231.679/2105.714/475.313 ms, pipe 3