Well others have already explained why what you're trying to do is a bad idea. Maybe if you told us why you're trying to do something like that we might be able to help find a better solution though.
But, for your information, one reason why this just won't work is that pack is always byte aligned. That's why (H5)* changes every third char. H is half a byte/char, so H2 reads a full one, H4 reads two, and H5 reads two and a half. But the next iteration aligns itself on the next char and simply ignores the half byte that was unread. So you're just losing data, not shifting any bits.
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