Done this. Now my speed in tests from A-C is 24-26 Mbps and real traffic is max 30 Mbps. Not bad but can I get more from this link ?
There is also a small problem. Changing frequency to 5Ghz-turbo seems to afect my ping time. Before was 2-10 ms and now is more fluctuation 2-45, is this normal ?
Its probably changing data rates more often as the wider channel has a weaker signal and is more prone to interference as well. Every time it changes from speed your latency will go up for a brief moment. What is your signal level, what is your data rate on the status page?