I suggest a) remove all signatures b) reduce the interval between posts for newbies because waiting sucks. 6 minutes is too long. Make it 1 minute instead.
In the meantime you can disable signatures in your profile under 'look and layout preferences' > 'Don't show users' signatures.' BTW this option is probably going to be used to justify keeping signatures around. "Why you can disable it if you don't like it" they will say.
This is to stop spam bots spamming all the shit they can before getting nuked. With the six minute restriction, admins have six minutes to react.
It also usually takes me more than six minutes to read through an OP and read some responses and come to with a response of my own, so I don't see why a newbie would need to pay more than 6 times in a minute.