Wi-Fi slow in Windows 7 x64 with Retina MacBook Pro / MacBook Pro (same generation)

We have two MacBook Pros same generation but one is Retina
I'm using a Linksys EA4500 router, firmware is fully up to date
Under 10.8.1 (fully up to date) both machines see a 300 to 450Mbits speed and if I ping the wireless router all of the pings are under 3ms
Under Windows 7 x64 (fully up to date) both machines see about 10-12Mbits speed but I see all sorts of time outs and high latency when I ping the wireless router, they look like 1,2,2,2,1,3,4,6,455,500,timeout,timeout,1,1,2,3 and so on
Both of these tests were done standing infront of the router
Both machines are running 5.106.198.19 of the Broadcom 902.11n driver (dated 04/05/2012)
Is any one else experiencing the same issues? I understand Bootcamp is provided as is but this driver is bunk

I've followed that link:
Find it here: http://www.wireless-driver.com/broadcom-wireless-driver-utility-winxp-vista-win7 -ver51001968/
and installed the driver, but I notice no difference.
The boocamp 5.0.5033 driver doesn't work any better.
Where can I find a really old driver (like bootcamp ver 2.7, which worked great with this MBP),... or.. how do I extract just the broadcom wireless driver out of the bootcamp exe or dmg file if I can get my hands on bootcamp 2.7?
Or ... Maybe my Actiontek modem/router that Centurylink provided doesn't communicate well with broadcom wifi cards?

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