hAP AC slow 5Ghz connection on Macbook Pro

Hi, today I bought hAP AC. I have a Macbook Pro Early 2015. Connect it to 5Ghz network and once I have a 600mbps, but now 350-400 is maximum. Macbook 20cm away from router.

Settings:

Too much power maybe. You should see values from the registration tab.

Sorry, I`m a newbie. Where is registration tab? Quick Set? And how to understand how much power I should set? I tried to set less power, but as result SNR does down in my bathroom. With maximum power it equals SNR from zyxel keenetic ultra.

http://wiki.mikrotik.com/wiki/Manual:Interface/Wireless#Registration_Table

Thanks.

Found how to fix that. I have to set “Channel width” to 20/40/80. But then I see Ceee, eCee, eeCe, eeeC - but do not know what does it mean. And please teach me how to set power for maximum performance with Registration table

How to improove real speed transfer speed over 5Ghz? I See that Tx-power too high and I do not know how to reduce it. By RJ-45 cable I have a 100MB/sec real speed but by wifi 5Ghz only 330Mbit/sec. Why?!

iperf by cable:

[ 3] local 192.168.1.10 port 50559 connected with 192.168.1.3 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 1.06 GBytes 910 Mbits/sec
[ 3] 10.0-20.0 sec 1.06 GBytes 914 Mbits/sec
[ 3] 0.0-23.8 sec 2.53 GBytes 913 Mbits/sec

iperf by 5Ghz:

[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 393 MBytes 330 Mbits/sec
[ 3] 10.0-20.0 sec 390 MBytes 327 Mbits/sec
[ 3] 20.0-30.0 sec 396 MBytes 333 Mbits/sec
[ 3] 0.0-30.0 sec 1.15 GBytes 330 Mbits/sec