WAP4410N firmware 2.0.4.2 bug: 300Mbps data rate not possible

I've spent parts of the past five days buying and exchanging several WAP4410N units because I was not able to achieve anything close to a 300Mbps data rate. I also tried various wireless-n network cards which were known to be configured correctly for 300Mbps speeds with no luck.
The highest speed I was able to achieve was 130Mbps, which is an indication that channel bonding is not in effect.
Then I came across another post in the forums:
WAP4410N does not exceed 130Mbps in N mode at close range.
where the OP mentions recently upgrading to firmware 2.0.4.2, though not treating that as the cause of his problems.
On a lark, I tried downgrading to both firmware 2.0.2.1 and firmware 2.0.3.3, and to my surprise, I was able to achieve the full 300Mbps data rate with both firmware versions.
When I reverted back to 2.0.4.2, I was not able to achieve the full 300Mbps data rate.
So, right now, I downgraded to firmware 2.0.3.3 so I can get the higher data rate, though there are other quirks to deal with.
Furthermore, when I do a web search of reviews, I can see that the inability to achieve the 300Mbps data rate is a huge source of complaints.
Cisco, please fix this firmware!
Edited to add: I found another post regarding the same phenomenon:
WAP4410n LIMITED TO 130Mbs in N-mode

Hi James,
When I bought the WAP4410N I was still using Vista and a beta of Windows 7 x64. My PC was reporting 300Mbps but I never believed it and just figured this was better then the Linksys Wap54g with DD-WRT. I was only showing 54Mbps on my laptops but the amount of data I could download over a minute was better then the WAP4410N. The best speed I can achieve (but only lasts a few minutes) is 130Mbps from the WAP4410N and downloads are painfully slow. Using a desktop gadget "network meter" on one of my desktop PCs with a wireless N USB adapter it is showing a speed of 54Mbps and a signal strength of 70% at a distance of 4 feet from the WAP4410N. At this distance I also experience interruptions in connection and poor performance. I do not know if my WAP4410N is defective but a beta firmware is to be released this month that is supposed to help. I have had to recommend other brands in this price range to those wishing to buy a stable product as this performance is not acceptable. My network is mostly GigaLan devices and strangely the intelligent switch reports the WAP4410N as running at 100Mbps with the firmware set the 1000Mbps so there is another mystery.
Best regards,
Brad

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