Shibby 115: max 5GHz speed only 130 Mbit

Hi there,

My 5GHz wifi on my RT-N66U (Shibby 115, AC branch) only connects to my MacBook Air with a max connection speed of 130 MBit, no matter how close I get to the router.

I have not touched the advanced settings. I wonder if this is due to the AC build I am using.

Anybody else having this issue?

Thanks!