I'm able to get 175/16 on my iPhone 6 over 5ghz while at work. At home it is similar, but sometimes the upload isn't quite as quick. But for the purposes of your troubleshooting, the iPhone 6 can definitely get 175 over 5ghz.
I prefer to give my 2.4 and 5 networks different SSIDs, and my devices that are capable of 5, I set to "forget" the 2.4 all together. I find that the iPhone joins the first network that it sees, and doesn't switch over to a better network when it appears. If I have both my 2.4 and 5 SSIDs set up on my phone, It'll grab the 2.4 one first as I'm in my garage, and then keep connected to it until I tell it otherwise, even when the 5 signal is strong.
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