Subscribing and commenting the way you are doing it is unnecessary.
Something easier would be using the youtube username and password, logging into their account and then doing the subscribing and commenting via submitting post forms yourself. It'll be a lot easier, trust me.
If you use firefox, you can use the "tamper data" addon to dissect the post fields that you'll need to submit yourself.
Otherwise, it's kinda a waste of time. And a lot harder to do.
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