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I have a few questions about your testing, nothing too big but I want to check before I add your data to the wiki.
1 warm up times.
How many miles did you warm up the car before testing? I find that on my car the engine is warm after 5 miles but the drive train takes 20-25 miles. I found this out as I did my first set of steady state ABA testing A runs, they did not level out until after 25 miles.
2. Winds.
I found that winds are ok (not preferable but ok) if they are steady, any gusts really mess up cost down numbers.
3. Number of data points.
It looks like you only have 2 runs for A 2 for B and none for A2. for the data to solidly show something (statistically) you need a min of 3 data points per run (3 for A, 3 more for B). you also must do ABA not AB.
After all that, I like the limited data's results, they hint at a rather large gain from the back bell pan. I bet the grill block is doing more than you can see, it tends to be a small gain so it takes a lot of testing to prove what it does.
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