How long does it take to blow the fuse? If it happenss fairly quick then I would disconnect one headlight plug and see if it blows. If it doesn't blow then the problem is most likely in the other light.
LED's don't draw much current so I doubt that it is blowing the fuse because of the additional draw. That and the fact that you put a fuse that is 5a more and it still blew makes me think that there is a short somewhere.
If you just keep increasing the size of the fuse and there is a short, you will wind up with much bigger problems.
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