Hi Adrian,
I'm pleased to hear about your new Ruckus Wi-Fi deployment.
However there's a lot more to configuring a wireless network than just leaving all settings on 'Auto'! It will very much depend on your Wi-Fi client device and it's hardware capabilities as to what throughput you will be achieve, along with enironmental factors effecting the RF, such as interference, attenuation, refraction, etc.
If you require higher throughput on the 5GHz frequency, you will need to configure wider channel bandwidths from the standard 20MHz. With the R510 APs you can configure 40MHz and 80MHz, but whether this will give you actual better performance will very much depend on the factors I've mentioned above but is certainly worth a try.
There is some further configuration information here:
https://docs.ruckuswireless.com/unleashed/200.5/c-ConfiguringIndividualAP.htmlFinally; changing the firmware code on the AP won't change the performance of the AP.
I hope that helps,
Darrel.