Router limiting outbound traffic?

Hello,

It appears to me that my Verizon Acctiontec MI424WR-GEN3I router is hard throttling outbound traffic.

I have FIOS 50/25 mbps service and with it the Verizon speedtest is reporting d/l ~ 55mbps and u/l ~ 35mbps,
great!  However, when I try to send a file using a http server, I am hard limited to 425,800 B/s (~4mbps),
which is well below the rate indicated by speedtest.verizon.com.  

I have tried both IIS and Apache on multiple different machines with no difference in results. I have tried a
multitude of different ports, again hitting a wall at 425,800 B/s.  Running the file transfer within the LAN
both IIS and Apache are moving data at LAN speeds as expected.  I then tried the same data transfer to the
same LAN destination, but forcing the path through the WAN port of the router and wham, the transfer was
again hard limited to the magic 425,800 rate.  I then tested the transfers to a destination outside the
router and once again the transfer rate was only able to max out at 425,800 bytes/second.

I was able to achieve transfers of up to 12 mbps to a remote FTP site using port 23, but with a web server
using any of the web ports (standard and non-standard) I tried, were hard limited.  As a result of this
testing, I believe that the router itself is limiting the outbound throughput except for speedtest and ftp.  

Has anyone else seen this?  Is there a way around this?  Will traffic shaping help in this regard?  Any

Ideas?

Thanks