Thank you for sharing all these details.
Can you access the adapter settings and check the preferred band on this device? You can also try checking for the wireless mode configuration on the adapter.
Here you can access and get more information in how to check this:
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in Device manger 6300>properties>Advanced
make sure 2.4+5.2 Ghz are set as auto
11n mode is enabled
Mixed mode= CTS to Self
the rest if the setting leave alone.
Right next to router I now get 300MB
I'm having the same problem.
Could you solve yours?
I already tried it... But It didn't work.
Any more hints?