WoL is a beast I have tangled with for a long long time.... from not having it working at all, to looking at my mouse causing a wake for some reason.
As far as I know your best bet is to look at your computer's "Power Plan" and internet adapters to see if they are allowing the feature. also, save yourself some grief and make sure it's hibernating and not sleeping, because sleep will always use power and drain your battery, hibernation is a full off state with a reminder of what it was like in it's last boot..
If you're still having trouble I'd love to help you snoop around for the fix (if it's possible)