I can't help you with the ralink issue but I can make a comment on the IVs...
Starting aircrack-ng while you're collecting the IVs negates the need to watch how many you're collecting. Aircrack does that for you and will try every 5k IVs. I find that a 64b WEP requires anywhere from 25k to 30k IVs. Just start aircrack-ng on the cap file that you're collecting to at the same time.




