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Is it possible to increase the size of my Windows partition without having to wipe the entire thing?

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Not with the built in tools. Moving the start of a partition is no trivial task. Resizing your main Mac partition only grows/shrinks it, but because your bootcamp partition resides further on your disk, it needs to be moved up before it can be grown. This is not a trivial operation and is not supported out of the box in either OS X or Windows.

You will need a specialised 3rd party tool like iPartition, but use with care and triple check compatibility.

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