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burnthesheep I think you mean .004 for the Crr. Check this out
https://www.bicyclerollingresistance.com
IMO, I would not focus on wattage per se in self evaluation on the TT bike. Speed is where the action is. Power is your currency to buy speed but there is a cost factor as well as mental focus. How well do you hold a position over time with a perfectly turtled head? Also, your current TT helmet is pretty fast. I tested it a couple of years ago at Velo Sports Center aero testing. It is fast because it is small i.e. lower frontal area.
However, there could be gains with an new Giro or others.