EA6300 Speed limit of MAX 40Mbps at 2.4GHz

Hi to all,
Yesterday I bought new Linksys EA6300 Router for my home. But I'm a bit disappointed.
My ISP provides me Internet speed up to 85Mbps, but the devices connected at 2.4GHz band can achieve maximum of 40Mbps (download and upload).
I've tried everything, switched ON and OFF WMM, No Acknowledgment, etc. Even updated the WiFi adapter drivers on my two laptops, but still no joy.
No matter what I do, I cannot achieve full speed at 2.4GHz. The 5.0GHz devices at my home have no problems though.
Any suggestions?
Thanks in advance!

Its not recommended to speed test on wireless as there are many factors and variables that can cause inaccurate speed test results on wireless. Wired is preferred and recommended to test with. Also not all wireless devices can't perform  the same way and maybe designed differently. 2.4Ghz is best with mode N, WMM enabled, WPA2 only and Auto channel Width for best performance.
Media Prioritization should be disabled to test or if you had it enabled, you need to set up the Advanced/Downlink option under media prioritization for you ISP speed package you pay for, so if you pay for 20Mb down, you need to input 85000 into the downlink box. Save settings and reboot the router. 
You may have interferences from other sources as well.
Any 2.4Ghz or 5Ghz cordless house phones or WiFi APs near by?
Any other WiFi routers in the area? Link> Use http://www.techspot.com/downloads/5936-inssider.html to find out. Use v3. How many?
Router Placement
Forum User - "Well I feel really dumb. After moving the router away from other electronic devices my speeds are back to normal. Just a heads up for anyone experiencing slow speeds, you might want to move it away from other electronics and see if that helps."
3-6' feet minimum safe distance between devices.
Placement on main level floor and central in the building and WELL ventilated is preferred. Not in basements or closets as building materials, or near by electronics devices could interfere or hinder good signal propagation.
http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=d9a3b1b2039741948a2365b053a93ea8_3759.xml&pid=80&r...
http://www.smallnetbuilder.com/wireless/wireless-basics/31083-smallnetbuilders-wireless-faq-the-esse...

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