As you have not mentioned me which iPhone you are using let me take all the available options.
let's calculate the maximum speed that a iPhone can achieve under idle conditions (Heaven).
Let's assume that your iPhone has 2x2 802.11ac
On 5Ghz 40Mhz 400 Meg
80Mhz 800 Meg
160Mhz 1.7 G
On 2.4Ghz 20Mhz 144 Meg ( 802.11n)
40Mhz 300 Meg
Taking your LAN speed, even 160Mhz bandwidth set on Ruckus you can't get that speed so let's strike that.
Now, let's see what's the Max that you can get on your phone with ZF7363 & ZF7372 (Darlings of Ruckus) as they are not 802.11ac so the Max that you can achieve is 300 Meg may be if my calculations are wrong 400 Meg is the Max that an iPhone can get with these gear.
In non ideal conditions, let's say when more users are connected to the AP with interference and switch that's connected taking all these conditions my prediction is 150-200 Max you can achieve with this set up, may be more if you are closer to AP.
Yes, the speed that you are getting is the best trust me you are doing fine than lot other Gear in market, I did the same thing to a customer to win Ruckus over other vendor ( other vendor claming best of best with all those fancy terms they got AI and Latest Asci ) he was shocked many think Best tech Gear costs Big bucks, but that's not the case it's not the Dog that matters it's the fight that the dog puts in matters.
Not to disappoint you, just check the basics run MetaGeeks' Inssider (trial) will do find the best channel that it suggestsu on APs manually and play with channelization check the speeds and when you are satisfied stop tuning more.
Hope it helps!!!