General advice I gather for setting QoS properly is to enter the upload and download bandwidth to 80% of the best speed you have from a broadband speed tester. To get as accurate of a figure as possible test directly by plugging into your cable/ADSL modem.
Hope that helps.
What firmware are you running? More recent firmwares, including the latest 260, have a problem with wireless stability on 2.4 Ghz WiFi for some users that may be making the problem worse.
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