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Apart from the standard WinXP config that releases about 5% of your b/w there are no 'tricks' as such to increase your upload speak. There are illegal ways like uncapping your modem, but when you get caught [usually takes a few hours] don't expect to ever get cable/broadband again.
The 396k pretty much caps you off at 40kb-45kb/s upload speed.
4mbps down could get you as fast as 460-500kb/s down depending on how accurate comcast are.
Don't trust those modem speed tests, alot of them simply can't handle the load of faster connections which is why you're getting funky results.
As for slower speeds, that's all dependent on routers and how your traffic is relayed around the internet, can't really do anything about that.
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