Interval Friday and Saturday

Did 6x5 minute steady states on Friday with power in the upper 340's to low 330's. Today, given the rain, I rode some inside this morning and then went out to get in 10x1 minute power intervals (444, 468, 490, 493, 493, 511, 506, 496, 513, 513) averaging 493. Then I rode a little more inside. Todays graph is below. Shows how steady the power can be inside. Bought a Giro Selector TT helmet but I don't think there is anyway that I'll be able to use it. Have the L size and it is much too tight. I really like the helmet design. Can't understand why the L is so S. I have four of their helmets and L fits fine on them.