TG,
Just tried your settings - wow!
MSS 536
RWIN 4829 (9 X MSS)
NDI (which you didn't list) 16
TTL 128
FTP from my ISP consistently 3.66kB/s, which is an improvement on my til-now variable speed at or below that.
From the second Microsoft ftp choice on iSpeed's drop-down list ... wait for it ... 10.3kB/s!!
Microsoft must be doing something funny at their site, 'cos no other site goes that fast. The same speed is reported by System Monitor and Cute FTP. Amazing.
My turn to thank you!
AA