Get a TT helmet that fits properly
This is a continuation of my open challenge to Nytro readers: Cover 40K in under one hour (link)
This is also a continuation of last week's helmet straps tip
For me, I noticed that in my race photos I rarely ever had good contact with my back (though this is part fit, part discipline, especially 3/4 into a TT). I went to Nytro in Encinitas, CA and tried on a few different TT helmets. To further illustrate, I went from this:
a merge of non-race-situation photos, one year apart
I was able to get my head lower with the same seat to elbow rest drop (it was the same on both bikes). For me, the Giro fit much better in between my shoulder blades and that allowed me to "turtle" my head lower.