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Better yet use Mobi unpack to take the mobi apart. The reason it is so large and so much larger than the other files is that if it is built with KindleGen it contains the original ePub source, a pure mobi KF7 format and a KF8 file inside the same file. There are tools that can strip the source file out decreasing the size by 1/3 but leaving the two formats together inside. This is the first step. There are two strippers, one in python and one in java. mobi unpack will result in all three pieces available separately. You can upload botht he KF7 version and the KF8 version allowing the user to download just what they need. For more details see our wiki.
Dale
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