@sly Maybe you specified the wrong type of proxy (http/socks)? If it's really too bad, could you write down your proxy connection data so I can check it myself?
This will fall in the same lines at the LinesFromFile but instead of Use Only Once, you will use them Unlimited if they are changing every X minutes. You can also add a WAIT to the usage of milliseconds after adding the resource. 300000 = 5 minutes