[LUNI] resuming large slow transfer

[sten]

I'm attempting to scp a large amount of data (~8GB) to a friend's house.
We're both on Comcast, and my upload rate is a measly 45KB on a good day.
I'd sneaker-net it, but I keep forgetting, and at least this way it gets
done. 

Or not. 

Since my link falls over about every 36 hours, I tried doing  rsync -r
--partial --progress to pick up where I left off. When I do this over my
wifi link from PC to PC, I get ~12MB/s on partial files vs the normal ~2.2,
I'm assuming because rsync is jut doing a sanity check to make sure all the
data is where it should be. However, when I do the same over the external
line, I see no speed gain at all; its like I'm just transferring the files
all over again. I tried using a --size-only, first in addition to
--partial, then in place of it, to avoid sending files I've already sent,
but that doesn't appear to help. Any suggestions on getting this stuff
across? 

Thanks!

Sten