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.