T530 and win8 latency issues

I have a Thinkpad T530 (2392-3JG) with a clean installation of Windows 8. I have been experiencing some gaming issues, when once in a while my ping rises to 500ms. I tested the issue by pinging my default gateway, and the lowest ping was 3ms, climbing to 500ms once every 15 seconds or so. I tried the same test on my win7 installation on another partition (but on the same machine), it does something similar, while ping jums "only" to about 300ms. On my sister's computer I get a constant 1ms ping to my default gateway, as it should. Therefore I think the problems must be somewhere in the drivers.
I downloaded the Intel Wireless LAN (11agn) drivers from this site: http://support.lenovo.com/en_US/downloads/detail.p​age?DocID=HT072084

I followed these steps and my latency issue did improve by about 20% - 25% so thank you, I'm now getting a PING of around 75ms - 80ms.
But I would also like to know if there are any changes I can make to the WGA600N Gaming Adapter that would decrease my PING time even further. 
Since I decreased the Beacon Interval and Threshold values on the router, should I also decrease them on the advanced settings page of the gaming adapter? 
On this advanced settings page there are also the options of Aggregation enabling, Short GI enabling, and Extra Wireless Protection -- Which of these boxes, if any, should I have checked? 
Also, should Frame Bursting be enabled on the router, and would enabling DMZ or QoS help any?  If so, would I want to put the gaming adapter's IP address/MAC address into the DMZ/QoS or the PS3's IP address/MAC address?
Thank you for any further assisstance you can lend!

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