Perhaps what W.S. said was awkwardly worded; possibly he meant you could add 6-8" of nosecone and only see the same benefit as 1" of boattail... which is darn near nothing.
You have already seen one of the difficulties of extended noses, that of hitting the ground.
Go ahead and test it, but I don't think you're going to like the added frontal area of that cone plus front wheel skirts. There are a few different movable front skirt concepts that don't add to frontal area that I think would have better chances of producing measurable gains.
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