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My rear belly pan was tucked into the rear beam axle, just like yours is. It ended up getting pushed *down*, because (I think) it was acting like a parachute. I would highly recommend continuing the panel forward of the axle beam, or something to keep air from getting above it.
My rear wheel strakes are ~14" front to back, they are about 6 1/2" above the ground, and a bit more than 1" away from the tire tread -- I continued the right one into an inner fender of sorts. Hucho mentions the space around the tires as a minor factor contributing to drag, in the 2nd Edition. The 4th edition seems to have had this edited out.
The main change I made on the right wheels strake when I reinstalled it (after it got whacked by a stick I ran over), was to narrow it. It was too wide by about 1" and this was a bad thing. If anything, you should err to be narrower than tire.
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