UAP-AC-HD not getting 1300

Hello,

So i just installed my first UAP-AC-HD but i am a bit bummed im guessing i need to purchase 1 to 2 more because i cant seem to get 1300MBPS on this thing. I read through some of the forum switched channels that seemed to help but cant get past 878MBPS on my macbook pro. Its a 2013 and i know it will hit 1300MBPS i was able to get it on SOHO routers before. Any insight on what/how i should configure the radios to get best results? I am using VHT160 and channel 48 right now. I put some screen shots below.