I find it strange that you're only picking up 18.88 mph in the second 1/8 mile. The 84 mph trap speed in the 1/8th mile is definitely healthy for a bolt-on 370Z. But it seems like your Z just falls on its face in the 2nd 1/8 mile.
Just to give you an idea: a year ago in similar weather I was running 82 to 83 mph in the 1/8 and 102 to 104 in the 1/4 mile. And depending on how I was shifting, my Z will pick up anything from 20 to 23 mph from the 1/8 to the 1/4 mile.
or maybe i'm overthinking this?
