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To measure the angle this is what I did. I took a 4 foot level and had it on the car top, I held it level and measured down off that. I would try a lesser angle (say 5 or 6 degrees) and see what happens.
As for your data, I trust that you are not messing the numbers, I just nodiced in my coast down tests that rolling speed was not a good indicator (we are looking for a very small change 1-4%). Where I drove on the road (crown, side, middle) messed with the rolling speed from moment to moment and run to run. This means that coasting to a stop was the only way I could really tell. I did have a good landmark (intersection) that I would roll through (I had right of way) at about 8 MPH (5 on the runs with out my Kammback, 8-10 on the runs with). any sooner than that and the data had too much variation.
If you can take the hour needed just try the full coast down. If you get the same results than all is good, if not you might have found a better testing method.
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