DrW should be there. I laugh that you think an aero helmet looks funny but a hole filled piece of styrofoam strapped to your noggin' is perfectly normal? Seriously, I think its a good idea to test your zipps, make sure the arbon pads are hitting in all the right spots, etc. I also think it's not a bad idea to do at least one short ride (maybe 10 miles) in your TT helmet to make sure there are no issues with that too. I believe in testing ALL equipment. You do not want 40 minutes of the helmet choking you because you didn't get it set up right before the TT.
And the PCad is not slowness. If he can hang on Nyack, he will be storming the TT.