Cisco Wireless :: 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.