Router Cofiguration for gaming

Hi guys, I've a Linksys WRT54GL v1.1 router, with the dd-wrt firmware, My own PC is connected via cable to port #1, and there are 2 laptops connected wireless to the router. My problem is, when I'm gaming, and any other laptop is using internet, watching pictures, videos, etc, it lags me a lot, giving me also spikes, here are my connection speeds:
Download: 2Mb/s
Upload: 768Kb/s
(Crappy connection, I know)

I've my router configured so the wireless network will only give away 1Mb/s, so that means that I ALWAYS have 1MB/s (because I've 2Mb/s) for my self, but it seems this isn't working, so...
The question is, does any of you know a configuration which I could use to improve this?... I also have my QoS turned on, with my MAC as high priority, etc.

Any help will be well received.
Thanks.

PD: Here are some pictures about my router configurations

One thing you overlooked: You need to limit the wireless UPLOAD speed.

If you allow the wireless to saturate the upload, your download will slow to a crawl.

Sounds good.