I see you set the TCP windowing on the router however did you set the TCP windowing on the server and client? Another thing you may want to try is Jumbo frames. Make sure the server, router interfaces, switch ports and endpoints all support Jumbo frmaes. This will increase the troughput. Good Luck..Please rate...
This is a very common question that people have; if no other application is using the bandwidth why don't I get it all. I think you are on the right track in increasing the window size, but this is still an individual flow and there is still a lot of latency inherent to the communication. You are subject to things like path MTU (big), TCP acknowledgments, Round-Trip-Time, application level acknowledgments, tcp buffer spaced (limited to 64K, I think), application buffers,etc.
There is something called the Bandwidth Delay Product (BDP) that calculates how much data can be on the wire on a network at any given time. This is ultimately limited by the TCP buffer space. There is a great document on this on the Pittsburg Supercomputing Center's website:
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